Malicious PDF — malware analysis report

Static analysis result for SHA-256 7901255d2c37e1b3…

MALICIOUS

PDF

94.5 KB Created: 2021-04-04 03:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b5ee85886603694e0c784b4b5a4c5276 SHA-1: 509b3b646aca8ff664a3388cc890624815caccc8 SHA-256: 7901255d2c37e1b30ad376adfea9f0171a244dc5dbde0015002d6027daabe3c7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. The embedded URLs suggest the PDF is intended to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://midufefew.ru/award?keyword=libro+de+robotica+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490377/normal_5ff5882889b60.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/iaU5jaV/50995806728.pdfIn PDF document text
    • http://fezopezatoxu.22web.org/gekufavadafulagapuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_6036ab79d8199.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/jihjgif/93521899569.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/aQS3nFB/zefun.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/gPjgPsu/pujiwanemijitamibiwep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5ffe02371da02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fe27a8a6d3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_600dec537d684.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/Yid3Ohc/pewdiepie_minecraft_world_download_java.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/ihfB2je/bairavaa_songs_tamiltunes.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/G8gi1ja/odds_calculator_fractions_to_decimals.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/iaicUjj/adventures_of_aladdin_2019_subtitles_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poravilotizeve.epizy.com/71237002327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128a40c3-8173-4e82-a75a-d18c0111ea27/divovetolunudopanexusage.pdfIn PDF document text
    • http://gasigigi.rf.gd/converting_area_units_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/zumutinaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccd9bbb-b248-4ec5-a254-16ed55724b7f/44112679968.pdfIn PDF document text
    • http://fetenebepoxoso.epizy.com/mu_cv_n_tng_ting_vit.pdfIn PDF document text
    • http://galukovo.epizy.com/full_form_of_boolean_in_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/13096524555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218b6e7f-cb40-4a1a-b4a5-06cd9af6f946/george_washington_gomez_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a1f0cb-c5e7-48e9-9263-33e7d9c86b3d/buxejidof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e243127f-4a3d-48b4-b9bd-fd8f0dd139e9/zizesuxifimidajasav.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 5408 bytes
SHA-256: d8f64b5ae0380223d23bf3e3c11563d31d3eae7860f69c8c3131e00165c5e3e9
font_01_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00013ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF7 13916 bytes
SHA-256: 0c2658cbbc39de622909e35307e8481da7785d65c8407424c994f87279067ef5