Malicious PDF — malware analysis report

Static analysis result for SHA-256 250606fe2f83c256…

MALICIOUS

PDF

73.3 KB Created: 2021-06-02 11:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63e09943cf0a1aa305017d54bc32a82 SHA-1: d8f8e2bc5bce6a16a2776603f2d714d10a3c115c SHA-256: 250606fe2f83c2568042da5ec0ad5e2a32019bdf02a3cabc46e13007aad13734
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 point to other PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://irlanc.ru/pbw?utm_term=gta+t%25C3%25BCrk+city+v3+apk+indir', indicates a lure related to game downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/pbw?utm_term=gta+t%25C3%25BCrk+city+v3+apk+indir
    • https://cdn-cms.f-static.net/uploads/4366063/normal_6068d2e0498f0.pdf
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6069da069bc93.pdf
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fc9271c87420.pdf
    • https://cdn-cms.f-static.net/uploads/4370307/normal_6018182637394.pdf
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/sepewofi-seloku-lifomerolupezub-wuxilapojezam.pdf
    • https://cdn-cms.f-static.net/uploads/4422906/normal_606d9c53136bb.pdf
    • https://dogonurexuruvu.weebly.com/uploads/1/3/4/4/134475431/vejomizur_pasixokasolor_rorum.pdf
    • https://cdn-cms.f-static.net/uploads/4408993/normal_6063e96a88939.pdf
    • https://xokejajolaliz.weebly.com/uploads/1/3/4/7/134718337/1782900.pdf
    • https://totixibepetuter.weebly.com/uploads/1/3/4/3/134345693/gepunaw-tatesukigenaze.pdf
    • https://zuverefexogi.weebly.com/uploads/1/3/4/3/134316215/likefevama-fubarebunirew-guzamo-burisafiga.pdf
    • https://static.s123-cdn-static-d.com/uploads/4481671/normal_60b4c06812907.pdf
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5feb6ea4f2f71.pdf
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fd7c22f42a6e.pdf
    • https://cdn-cms.f-static.net/uploads/4485001/normal_60183fc092e39.pdf
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/7582823.pdf
    • https://cdn-cms.f-static.net/uploads/4367277/normal_601b1847e8fb7.pdf
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/zisuvot.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/mopifexubebuzuboze.pdf
    • https://cdn-cms.f-static.net/uploads/4379217/normal_60644af884403.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dd21.bin
fd76ba8c69bad6a59b987fabb14d3daefc878e93b22233e84c2312ac1c27b1d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 5400 bytes
font_01_sfnt_off0000ef76.bin
fed2f1561ea4fc1ca2b2fad8d9e96efe0078fdf43f95a42c87ee49f4db22b5c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 11896 bytes

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