Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c682bfa6247fb64…

MALICIOUS

PDF

107.7 KB Created: 2021-02-13 13:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1ed7d51136729eb968f53998cb0cc590 SHA-1: 844af62601bb3ef61d32fef363154d9afc127d9a SHA-256: 1c682bfa6247fb6469c47f6c7f769b517a8d8ae11c96c8f2baf4df54d31b0866
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

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://bologen.ru/123?utm_term=the+man+in+the+water+short+story+summary PDF link annotation
    • https://cdn.sqhk.co/porodiwaten/RUpjiRc/vugojon.pdfIn PDF document text
    • http://gramnews.xyz/78162795153jwmb5.pdfIn PDF document text
    • http://mon-fortuneo.best/lipetapatejiee6j.pdfIn PDF document text
    • https://wenudujajavu.weebly.com/uploads/1/3/5/3/135318124/wanub_mikov_jupusorate_tuxinofolupanap.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/hBNgfif/vajiwejimexosewipekukato.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/VDifwij/16442785999.pdfIn PDF document text
    • http://biomanix.best/the_human_centipede_full_movie_480poxg4g.pdfIn PDF document text
    • http://fefikaniki.22web.org/4646356931.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/siwedorov-dawemasagupal.pdfIn PDF document text
    • https://ponigeje.weebly.com/uploads/1/3/0/8/130874529/1318902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sumidemeg.epizy.com/30504671944.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/ascope_pmesii_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/videocitofono_bticino_classe_300x13e_manuale.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/4701080748.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_off00016978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16978 5036 bytes
SHA-256: 254ec62e228edd934a006981b7bad94bc6b5d0e2df0e500d9a2f9b5d941a5a33
font_01_sfnt_off00017a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A7A 11336 bytes
SHA-256: 2aa9319f14d9197ba35ab5e982733d84dd87115f2066e1ee2c9c093c91ff9bca

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