Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9d7ab507973656…

MALICIOUS

PDF

68.8 KB Created: 2021-02-10 15:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4461a3cd469c207bf053d788b72d480b SHA-1: db6d50168dd09caa346faa5506670b00f19f6a72 SHA-256: 0d9d7ab5079736563f11a6837574c9a9c2b5517efaede8351a6b238a8cf72617
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely 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://jacksth.ru/123?utm_term=real+clouds+skyrim+special+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5fd692dd238e8.pdfIn PDF document text
    • http://online-sistem.site/mozizuwutafefugisajpokr.pdfIn PDF document text
    • http://natbeach.space/fisulukexeguvosujopdfgmv.pdfIn PDF document text
    • https://visigeporoxibus.weebly.com/uploads/1/3/4/1/134131572/masusibu.pdfIn PDF document text
    • https://semizomemakov.weebly.com/uploads/1/3/0/7/130739936/9650828.pdfIn PDF document text
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/pivofu-toxuxojokiludik-datevi-tekamadasobofir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5fc6820f9c69e.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/1657769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fff97faacfed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonizevugopu.rf.gd/bollywood_hd_mp4_mobile_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/jobiwop.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gevupebedazo.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/kindergarten_worksheets_writing_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/96141528092.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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 5392 bytes
SHA-256: 676a311ca61d94502ccff92a0f5556652521da3d18e0629dd7f41c9a6236bf4a
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 11164 bytes
SHA-256: 5381b3a45a80a4d69eef11464c73dc84fda351e4d8ee93853cc0cf58130332b6

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