Malicious PDF — malware analysis report

Static analysis result for SHA-256 430e3ee63d177fb3…

MALICIOUS

PDF

79.8 KB Created: 2021-06-07 16:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b206c3c3c2b67f3c8fb4ba71753f4081 SHA-1: 6b08d061a13cf79d8e540d0b8ccf5bffe9741f60 SHA-256: 430e3ee63d177fb320bed98e595b781e6ee66f5e2b4a1745f7d9dbaf14b2e17e
156 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ClamAV and an ML classifier, contains a significant number of external links, including one pointing to 'synerhu.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of external links and the overall detection suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/pbw?utm_term=azar+english+grammar+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4470980/normal_60460f2665828.pdf
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5ff2c274d59ba.pdf
    • https://cdn-cms.f-static.net/uploads/4496360/normal_602501cbb20d0.pdf
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/sojuv.pdf
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd31a4093cf8.pdf
    • https://cdn-cms.f-static.net/uploads/4454179/normal_605d85f369718.pdf
    • https://puzilefamurujuz.weebly.com/uploads/1/3/2/7/132712080/7d31e.pdf
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/6890906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/095794b8-7708-4185-9633-7d9e1fdb5b33/megisodo.pdf
    • https://uploads.strikinglycdn.com/files/f854cef3-24bf-48a2-93f6-63f737dc9741/53900862407.pdf
    • https://uploads.strikinglycdn.com/files/0d2b5301-d8ec-467c-87e7-d75f7bee2b67/what_are_some_of_quantitative_methods_of_measuring_population_sizes.pdf
    • http://tereburokofe.pbworks.com/w/file/fetch/144574281/19011802903.pdf
    • http://zopujoxobug.pbworks.com/f/26708456432.pdf
    • https://uploads.strikinglycdn.com/files/e1a1f97c-e3c6-42db-a486-2b19c2a0331d/wumafopemiwolirut.pdf
    • https://uploads.strikinglycdn.com/files/58ad7b00-3056-4c71-b144-cc94e379a1be/sofugunimijuki.pdf
    • https://uploads.strikinglycdn.com/files/df68a9eb-8bd8-4735-9c0c-e922710c545f/nautilus_nt-cc1_height.pdf
    • http://beratirupo.pbworks.com/f/japubezasufevun.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_off0000f1ae.bin
5e3edc907e45125b65be96ee4fa84e3c81596a692d73631e4d4d13c6f5cdbb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5588 bytes
font_01_sfnt_off000104a0.bin
874a5e0667e81b712fe93d6913d9763ececd6262ef4af61ccd83eab1da5059a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 14556 bytes

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