Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7971c68b9a9535…

MALICIOUS

PDF

84.6 KB Created: 2021-06-04 08:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a379f274775e66f7d32706d882fc2ed SHA-1: 51ef3da41d4ef0ab2e28f4f36e36af84977d4d00 SHA-256: ce7971c68b9a953587a2d88f63c66765a4e7b71e94ed5cdc5a6b8295ffb3be25
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 pointing to PDF files, suggesting a link farm or a method to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/pbw?utm_term=autocad+2010+commands+with+examples+pdf
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5ffbbe843d14a.pdf
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6033cb1b54aee.pdf
    • https://cdn-cms.f-static.net/uploads/4470221/normal_60420acb07cc5.pdf
    • https://domekemukud.weebly.com/uploads/1/3/5/3/135327345/05bf334fc1.pdf
    • https://cdn-cms.f-static.net/uploads/4499283/normal_603fdcfa76ca7.pdf
    • https://cdn-cms.f-static.net/uploads/4444856/normal_602b41037c7be.pdf
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/5260940.pdf
    • https://dikodaselafilug.weebly.com/uploads/1/3/4/1/134108642/0b0b742d6c.pdf
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fc7db79ecc22.pdf
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5ff1de643445d.pdf
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6057bbbc46650.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_603edfaed49d6.pdf
    • https://xesisezedowajax.weebly.com/uploads/1/3/4/7/134729639/bb4f5bc.pdf
    • https://cdn-cms.f-static.net/uploads/4416666/normal_6017dd49b2cd7.pdf
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fe09afcaa438.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dajodovilav.pbworks.com/w/file/fetch/144564600/gafokagowus.pdf
    • http://bujolajoxek.pbworks.com/w/file/fetch/144528417/20702248862.pdf
    • http://wejojixi.pbworks.com/w/file/fetch/144424014/dedutuxinigudukalopezuze.pdf
    • http://watusuxipidu.pbworks.com/w/file/fetch/144423495/different_kind_of_depression_medicine.pdf
    • http://xuruzinijub.pbworks.com/f/la_tejedora_de_la_muerte_libro_completo_descargar_gratis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f1.bin
bec8e2478381845c5d76e9efa36266064bfb4f47bf00a3247abac52e41762168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 5776 bytes
font_01_sfnt_off00011d9f.bin
df10113d4db222c2f9eb8108c0a4284e54cddec6ac917759387e7572e3925d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 11560 bytes

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