Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b906f413615cb3…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 09:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 02f77feabe24fe15da4c23433adb4bd3 SHA-1: 9cf6513d9127bd4dd811bc4b27450728e6543674 SHA-256: a1b906f413615cb317d72a13e3f36bc3e883491aff5d337bd9aa556748378398
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://zajinet.ru/award?keyword=learning+strategies+theory+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495536/normal_6047c767ca43d.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/B5iflRR/56137309938.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/flUjgjb/kowuzajut.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxasedazu/zChiKjg/blue_snakeskin_retro_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_601903761d035.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/Yc4Ur7P/train_controller_jobs_london.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/i9jb8j6/resuvinupixafepogibovobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_60206e7a51c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_60303d2d533c7.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/bjatFQ9/brasfoot_2019_atualizado_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/ggzjhge/52734050773.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/cjaFOjg/91557652613.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/gPyDyeo/tobacco_basket_wall_decor_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/M63jgic/basketball_shooting_machine_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/jcgfxVs/ximazutiboxazozawavilabe.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/hihh0ia/gimikatexenojuvejozufopit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_4a32e856d3db49309c88bbbe5d3c0b35.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_dbae34dbe8814067ae46c901fb5152b0.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_7fdb2a32db8f42f790ea949aac386af5.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5312 bytes
SHA-256: 85611d8eaf423fc45daef905fa733d4fee6b3c5d1e89fe7788eca15d622a53f2
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10604 bytes
SHA-256: 4cc1084bf50d826716ae2cb0739b50b6c18711f35cc653a03dea8a9180c5d2cd

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