Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bc1f63644e84bb…

MALICIOUS

PDF

74.9 KB Created: 2021-02-27 20:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6fdfaa3f99a647f7b8212cabacb2c610 SHA-1: cb257a9346b4f3557a88e0bd576ef7a652db3bb5 SHA-256: 08bc1f63644e84bbebcc8529a2ea452a3bca7aa78abf2cc9950f952dc9fe3925
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect the user to malicious content.

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 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://jottigo.ru/award?keyword=ap+physics+1+chapter+2+test PDF link annotation
    • https://cdn.sqhk.co/pigujoxexate/Wyidkij/warolevamovik.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/jcvCIie/wigiretifuruvu.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/jjIiehi/total_conquest_mobile_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rinulazopun/dThfjf7/96785942149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_6022e6931aca0.pdfIn PDF document text
    • http://creditreportfast.info/56944591859mobeh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_6005916c06e5e.pdfIn PDF document text
    • http://beststudent.fun/nomevujuroxotolubebelitu9ff.pdfIn PDF document text
    • http://avbox.org/15303524323vctaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/aidjj0F/80142536922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_601319d7912b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fe1a8eb93864.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/87876922381.pdfIn 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://s3.amazonaws.com/sirilagewuga/seludel.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/how_did_the_second_great_awakening_contribute_to_reform_movements_quizlet.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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 4836 bytes
SHA-256: 19756f2a7e98dbd669bc4fa93c25dc1cbe00ed23a3b771f23040e8d8b47cc769
font_01_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 10284 bytes
SHA-256: 646044677ea6d0ae9eba842667fd53606389bec4c606c4ed840d754b2764d596
font_02_sfnt_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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