Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f31ea36c62aea0…

MALICIOUS

PDF

70.5 KB Created: 2021-01-15 05:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 311475f73493fafee859f96e0ca16a48 SHA-1: bbb36b3ca2ee699dd2a8df7d33682fab67699ed1 SHA-256: 77f31ea36c62aea06d7204860e9302c264418ba613aa30b57d435a2cfac62f78
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, indicating a link farm or content aggregation strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign, possibly leveraging embedded JavaScript for redirection or exploitation.

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://traffset.ru/123?utm_term=how+to+make+gold+color+paint PDF link annotation
    • https://cdn.sqhk.co/fedovusig/hkDhcXX/91400950726.pdfIn PDF document text
    • https://wilepera.weebly.com/uploads/1/3/0/7/130740018/ruvedejapuxo-zaxewatakaraz-kisorawezageju.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/xenazureli_kuzizotu.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/4gijihc/55673800921.pdfIn PDF document text
    • https://site-1244934.mozfiles.com/files/1244934/wallpaper_blank_face.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fab28415da31.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/cSabgdt/audio_pro_c5_vs_sonos_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5fe8b8b42d487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_5fb3fa613c745.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/2sB5ZtG/fun_halloween_party_games_for_all_ages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f90d4cc1c32f.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/hfBjegc/pudapovijaxofap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_5fa56f3fa74d4.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/ejjtYih/37058647499.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/yhchfi4/63828189673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wemazun/duritotiwuzejolikixaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 5120 bytes
SHA-256: 8d105b2afb6fb1379457e029edd7bc4308b6c0fd7e92a3d85df7201357a845e7
font_01_sfnt_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 10684 bytes
SHA-256: 948c9afe4b4d6c7f7109012ad28074da893d9e91e53dc60e2f4e3011820301e6
font_02_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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