Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4fc2c21b59cd91…

MALICIOUS

PDF

74.8 KB Created: 2021-02-13 19:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a571b0782b26896af83746034fa3927a SHA-1: 374799cd31bdc27cb84445ce21fedf198588f7e0 SHA-256: 2e4fc2c21b59cd91b4d0811a990eea01c24811e38c92b54c43885fd45b725b7d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wb?keyword=pmi%20agile%20practice%20guide%20espa%C3%B1ol PDF link annotation
    • http://usmileofficial.site/vsco_apk_full_packjnjzy.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/3b75415122d571f.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/xesixorulewulix.pdfIn PDF document text
    • http://falufob.iblogger.org/fadidozafa.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/jajavefavusuxerifope.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/f1ee0146.pdfIn PDF document text
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/xosasu.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jdji8MC/sitamobovaluvovavuwilidum.pdfIn PDF document text
    • http://kefisuful.iblogger.org/60283323598.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/368301ef1ea4.pdfIn PDF document text
    • http://suxiwef.22web.org/wamejov.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/7MBhdDw/97187478977.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/jigibopejatejebuw.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/nitizobuv/tidigubewijasiluna.pdfIn PDF document text
    • http://zapudeni.epizy.com/learn_online_advertising.pdfIn PDF document text
    • http://suvoxezol.rf.gd/brickleberry_o2tvseries._co._za.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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 5608 bytes
SHA-256: 331a19718f8ec4e1a17b17b829d32de028addb211be835f444c5dbda973fe0ab
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 11324 bytes
SHA-256: c7a46116c0e5341106a29d97127bbc47cf0c3c1b4db5ae6f8dee32ecfc7ea169

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