Malicious PDF — malware analysis report

Static analysis result for SHA-256 065c3e340d8fd325…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 23:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9dd1e0c936ee50711642e75eb866b4e SHA-1: ce2f361999c2d318f27addd1881eb14e6b96b42e SHA-256: 065c3e340d8fd3253bc19ce6ed471969cbd68be4411812ee7c19ffa4e573a49b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=knot+tying+guide+for+jewelry
    • http://kefisuful.iblogger.org/50375125157.pdf
    • https://static.s123-cdn-static.com/uploads/4462694/normal_5ffbe6acd9ece.pdf
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/netugomuneroje_korulag.pdf
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/5749465.pdf
    • http://milesnires.xyz/romeo_and_juliet_act_1-3_quizletdnpya.pdf
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/polepiv-bidepofigixabek-lezeg.pdf
    • https://vowijavig.weebly.com/uploads/1/3/4/3/134319359/f1f72b.pdf
    • http://mawejufikesiruw.22web.org/minoditem.pdf
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/kupeviditopu.pdf
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/3539135.pdf
    • https://cdn-cms.f-static.net/uploads/4464067/normal_602d978de4498.pdf
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60238496070f3.pdf
    • http://uscreditreport.info/cub_scout_rank_uniform_placementfetiq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sifebina.epizy.com/sap_basis_admin.pdf
    • http://zogakule.rf.gd/43689288798.pdf
    • http://tevomare.rf.gd/questionnaire_validity_and_reliability.pdf
    • http://zefifimagami.epizy.com/35194462648.pdf
    • http://folilef.rf.gd/46168060839.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_off0000e88c.bin
1fecba33b3d6c239fac48ed2cd135f1a4984d40fd815c7382181467f3b4b20a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 4928 bytes
font_01_sfnt_off0000f987.bin
33c894e857cb62804f411c34a7afa176b2a2cb1c3b50dd04cc052195c3108c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 10972 bytes

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