Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c6258d5835641d…

MALICIOUS

PDF

87.3 KB Created: 2021-05-25 05:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: de35a14c3e83324ca2186869f6cdbfae SHA-1: d51d36adedab94fb593425dc58b6d1304851030d SHA-256: 25c6258d5835641d51dab05af21b4063a68eaa6106a344f5ea28677fc39f3780
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicative of a link farm. The primary URL, 'https://fokemale.ru/strik?utm_term=free+fire+diamond+maker+app', suggests a lure related to in-game currency. ClamAV and ML classifiers strongly indicate malicious content, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=free+fire+diamond+maker+app PDF link annotation
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/6151835.pdfIn PDF document text
    • https://kexidenixerebez.weebly.com/uploads/1/3/4/4/134467946/fuzawexemuw.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/tiguzuro-katapetojud-ridudow-bipamika.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/sofizatos_nuwopex_segexaravapupi_movixi.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/safofefuke-xonoburege-xajedi-lidesip.pdfIn PDF document text
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/mijus_dikodofuna.pdfIn PDF document text
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/8186761.pdfIn PDF document text
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/c07bb4c2eb7f57.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b26a17a5-26a5-4924-8b0f-466ff62188b1/4332468988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3ebcf9-e8ad-40ba-aef7-1be3b40828fc/how_to_get_my_brother_printer_to_scan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2e488d-a9fc-462d-8ab3-38230e4090c2/90883293119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c93ef5-726b-4341-9db2-e2161c767023/ipod_nano_7th_generation_will_not_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48ab0fe-7417-4716-96de-fe508fb02af8/76686015781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39df06b4-e999-4707-a94e-d4c8aff33b63/christmas_song_medley_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07151d1c-4b44-434d-90df-bad711da1030/xewumozepujikevugek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d94e18-4345-4e34-aa13-ab169f1d6968/90447736399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a410fc-5fcd-473f-9a06-146c31fec1da/bobbi_brown_beauty_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713da98c-0b8a-4ce9-a109-776c571cc0e9/62479197025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e89bb1-a6f7-4063-9cd3-60ce6524d0f7/beats_by_dre_speaker_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bded483e-9935-4e5c-8eb5-bd53c172287b/jonipozobonewezanojaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52808b3-c66b-46b3-8b8a-fd1e9ebfed3b/ice_cream_makers_amazon_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80465154-4c09-428f-b058-74157799e1fa/8242682251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c24a669-5529-4188-9292-be1e71e02e8c/fallout_4_legendary_weapons_console_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ab77dd-bcd3-40e9-85a8-061892b7a077/machine_learning_packages_in_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418fe1b4-2fb3-49ce-9d1e-1852ffd14317/how_to_attach_upholstery_hose_to_hoover_steamvac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26fa81f-7a79-499e-83e8-124a11f2c463/9442243148.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f38f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF38F 15064 bytes
SHA-256: 417b5412efedf06793c5a931bcea56255a248e50731ef4bb61483152530a1aa9
font_00_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 4704 bytes
SHA-256: e621b2584876860db84e34e3149e0aa3bbe49e117f8e7b2bc3bc0fa63388278c
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 9912 bytes
SHA-256: 44aceb28f17f8c9c26f05959e8d4cfaa0dbc455cfd834a6643d22697f63dd02e
font_03_sfnt_off00013f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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