Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb594ccff56798ef…

MALICIOUS

PDF

101.4 KB Created: 2021-06-07 21:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69843bc3f2557a6f762ac9ab06a14ce7 SHA-1: cd8a0dac2b22057727a4c505628ef33d1be0849d SHA-256: cb594ccff56798ef98ab20c6957c84c2522467f9e0cd85fcd53b3b632847ebc1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://ketchas.ru/pbw?utm_term=bnmc+student+registration+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426416/normal_60171ac781b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_60b85ff1403dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_5fd350ee25580.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/lawarumejelorebewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_602e5317cfd64.pdfIn PDF document text
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/saduganefatoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365656/normal_6001d4cc6adcd.pdfIn PDF document text
    • https://gosazakinuda.weebly.com/uploads/1/3/4/8/134861856/tajemojedaxupuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_60571e0a1198f.pdfIn PDF document text
    • https://namuxewanazojo.weebly.com/uploads/1/3/4/2/134266474/jubufetarax-gunobafenov.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392854/normal_60aff8150d5eb.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/6483550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fcf1f9d2246e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_60240925b1de2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ba6d3f-a20b-405f-8cb8-97a03f619180/where_is_the_coin_trap_on_a_maytag_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f725bb47-eaa5-4f4b-9904-464449a42812/58079316333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6319577f-782e-42f1-898f-21f19dfa2363/html_programming_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7484510e-4685-4a37-8d94-9b7174a8ea3b/gugabiromugujosivevezinik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474436d7-fa1b-4b06-a8d6-a30504cdc1bb/forbidden_archeology_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5480791b-7a74-44fc-986b-5dde45060731/star_wars_the_old_republic_shadow_of_revan_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6158f382-626b-4c72-b64c-b8d46dfb8182/gebazizetugatikamivuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3090c806-fbda-4489-be90-869f46aef22f/xogetegone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0902f3d-8df0-4583-b3a2-a6ac4730a9cb/zimadadavasujanebugez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2346d58c-67f3-433c-a540-8fa8accc70ee/autocad_2010_commands_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612ea579-7520-4187-ba6e-b5c4e99c8a0f/piano_scales_chart_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e9e357-2b9b-4e88-85e8-a622b999f29a/after_3_anna_todd_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d6d65b-dbe3-40bd-965d-6ff982f912f4/how_do_i_pair_my_true_capsule_soundpeats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338d6c9a-b51f-4d1b-913d-828f0f7214a8/bakisixaroxodofagijitog.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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 5360 bytes
SHA-256: f2e48fbde2e8eea98fef7d3c30f0f814d239a3cf111a14ff053cc15702009944
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 20136 bytes
SHA-256: 42ca5d2a5177f2f7660f00a06399313420b618b66cc6da8d402ef23ad33ce26e
font_02_sfnt_off00014aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA1 10572 bytes
SHA-256: ed921e5ee9e9630c0fbebfef37f4bb30e93553310f3b205916c1177409ffee1a
font_03_sfnt_off00016eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEB 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449