Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f216c91bc285d0b…

MALICIOUS

PDF

76.6 KB Created: 2021-01-31 00:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 754541f22f0fd2afaf9a9c1bef41b95c SHA-1: 9db8ea74678b166026431f1b0b59e2598579802d SHA-256: 0f216c91bc285d0b324e734e716075055d0a6bc27cb72e99b927e141838961d9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=starburys+basketball+shoes PDF link annotation
    • https://noromilo.weebly.com/uploads/1/3/4/5/134587763/fac1f99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_5ff36d18d7e91.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/geicgjY/world_war_1_combat_flight_simulator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5feb9630549b2.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/aMjghjC/japan_used_auto_parts_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/ja6S7ie/12456856300.pdfIn PDF document text
    • http://betixisu.22web.org/specialized_allez_2018_size_guide.pdfIn PDF document text
    • https://xejoxobufedad.weebly.com/uploads/1/3/3/9/133997298/9830747c1b96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulavofi.epizy.com/night_elf_hunter_leveling_guide_classic.pdfIn PDF document text
    • http://gojexigubobe.epizy.com/27125362602.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/find_fault_with_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/accme_rules_and_guidelines.pdfIn PDF document text
    • http://poduzamilikuki.rf.gd/79830795490.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/coursera_introduction_to_marketing_quiz_3_answers.pdfIn PDF document text
    • http://zeledevunetoxow.rf.gd/1151800769.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 5184 bytes
SHA-256: 771392fabc73fc47bceec9f33f87a61de55e1968449345466a330291d39d7d9e
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 11192 bytes
SHA-256: 58cdecb0317347637335772cd6741d4eafe8bc7705d8f7bb3759ba091cddc630

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