Malicious PDF — malware analysis report

Static analysis result for SHA-256 936c76324276e27b…

MALICIOUS

PDF

99.4 KB Created: 2021-05-30 20:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb53c38942edaaef587855cfee23b034 SHA-1: 2cc87502221faeb057af64a76286e72575acf646 SHA-256: 936c76324276e27becd38771dd7f76ba9ef98630ed8c467778f270a685aec3c4
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 potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment designed to redirect users to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=global+fortune+500+companies+list+2010
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/risur_vudinunisijex.pdf
    • https://derodukiv.weebly.com/uploads/1/3/1/4/131453370/1251834.pdf
    • https://cdn-cms.f-static.net/uploads/4473035/normal_606ddf767867f.pdf
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/fca274f169.pdf
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/9353913.pdf
    • https://pafuzoxim.weebly.com/uploads/1/3/4/5/134585506/9710751.pdf
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/xojivipasa_lofafuzabudize_losufede_forutatija.pdf
    • https://zexexoxanevekig.weebly.com/uploads/1/3/4/6/134672397/7411267.pdf
    • https://dukilasurijase.weebly.com/uploads/1/3/2/8/132815907/xodepana.pdf
    • https://vaxedokumam.weebly.com/uploads/1/3/4/2/134266394/5960935.pdf
    • https://lizunega.weebly.com/uploads/1/3/5/3/135395432/vinevi-sopafugi-xebutuvomaxilub.pdf
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/e35815.pdf
    • https://nopewiviguzine.weebly.com/uploads/1/3/1/1/131164125/fetukobagunupo-fobajarak-fevatoravewusat.pdf
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5ff0a50895bfe.pdf
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/nofute.pdf
    • https://kabolonopatine.weebly.com/uploads/1/3/4/2/134265344/2165772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/98097297-845b-4d84-b520-ad8c3f8344a6/nufajagigib.pdf
    • https://uploads.strikinglycdn.com/files/f71a9221-29ee-4fc1-a449-1bfc9e657dd5/new_navy_uniform_regulations.pdf
    • https://uploads.strikinglycdn.com/files/f3778b19-2189-4346-900e-c530b388504d/annie_on_my_mind_summary.pdf
    • https://uploads.strikinglycdn.com/files/35309b79-e090-40fb-88fe-b316c72693ef/sylvania_model_sp258_manual.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_off000143ee.bin
4a83a66c8b50e31ea3d083d1b7bac465b892fc956f5f5200ba02c594be533f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 5780 bytes
font_01_sfnt_off00015791.bin
600885a80e51e1567197b1ed15a3faaed8bd977b2ab4384ec0b05b4134e67063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15791 11444 bytes

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