Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fac12722eb82297…

MALICIOUS

PDF

77.7 KB Created: 2021-02-17 22:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 933e23d6c3f4c67168e30614a8322bf2 SHA-1: c335b2416b89ed469a3b779fe2167e09bff95f21 SHA-256: 9fac12722eb822976102621b42ebbcc28953aa8edab05a673ef951484be365f3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, pointing to various domains including weebly.com and cdn.sqhk.co. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful 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 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://leonvi.ru/123?utm_term=jack+and+the+beanstalk+1952+film PDF link annotation
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/zavexubinosutikofek.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/6326710.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/iehqid4/system_of_equations_linear_algebra_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/daajjhj/diamond_store_free_diamond_generator_tool_referral_code.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Oidp6gx/bogubawopetutetewaxeg.pdfIn PDF document text
    • https://mifokidosunatav.weebly.com/uploads/1/3/0/9/130969664/xagozutomatuju.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/gfGgjif/temple_run_game_download_apk_softonic.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/5614794.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/8d23cf1925aa.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/zufobatab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/need_for_speed_no_limits_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/blender_character_modeling.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/google_discussion_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/nofowubilaxijafujaxesupa.pdfIn PDF document text
    • http://lijulipewagikev.rf.gd/96737679665.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_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 5824 bytes
SHA-256: 6c02f4e692a5e5b0a3d14405be8d449e7627c55b656f6e9b8f788eb354366d61
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10820 bytes
SHA-256: 37ce3b8294105ff6b230861727f0a5a4abe1c28d7989edb30866f2a67d13f272

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