Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b65570f43f74e6…

MALICIOUS

PDF

85.0 KB Created: 2020-12-27 12:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f45d368ff3347ff3cd9c8ae541ed5d92 SHA-1: 73c2791466a1cc6da9a90f0346279d9fa77ba9a4 SHA-256: 42b65570f43f74e68ade93f1ac0b40b511fdfa4ca46365cfc43afd0a34fcb2ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users 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 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://trafffi.ru/123?utm_term=in+congress+definition PDF link annotation
    • https://cdn.sqhk.co/dofewijoras/iIhhnIi/rovaravo.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/ghgKhgv/cryptopop_earn_free_eth.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/236792.pdfIn PDF document text
    • https://judupivaruva.weebly.com/uploads/1/3/0/7/130775992/kuxamofa.pdfIn PDF document text
    • https://cdn.sqhk.co/rodoruwuwab/cjxZsja/truck_bumpers_at_iowa_80.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/igdjejf/dugezumejukiwosadabot.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/bKELAhe/subway_surf_fortnite_code.pdfIn PDF document text
    • https://cdn.sqhk.co/razupojoja/FigjSia/55420263205.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvomafoda/dgj3tzm/tornado_bus_near_me.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/bulalowisu/american_pie_4_movie_hdpopcorns.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/tubujedawepenik.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/33002178516.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/linuditigivigaxewose.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/nodobujutepanizazuk.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/metigab.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_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 4884 bytes
SHA-256: 35d40acb2eb58147cd40878a3f165055ba81ddd87259c43f529f4829342fb384
font_01_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 10172 bytes
SHA-256: 2d51816d88b60f939312d8c288cc39efbffa8d042e40c47b188d385dad4d2607

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