Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7652acb83be6773…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 22:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af292436780e3a1f0cf628e930a62ec SHA-1: 3169bb539d20e62034f9c0d2a23fcdca92a230ec SHA-256: b7652acb83be67737d6ac0eea4d8613c8ac52861d30a38b93c6b6e6db48a312b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. One prominent URL, 'https://seumenha.ru/strik?utm_term=what+is+mba+in+logistics', suggests a lure related to logistics education. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=what+is+mba+in+logistics
    • https://cdn-cms.f-static.net/uploads/4502268/normal_60280fe0c447c.pdf
    • https://nitejaxerovon.weebly.com/uploads/1/3/1/3/131379530/562dfd14e21987.pdf
    • https://cdn.sqhk.co/ganuniwiku/haliiSc/38560782777.pdf
    • https://cdn-cms.f-static.net/uploads/4413696/normal_601ad8232c67c.pdf
    • https://static.s123-cdn-static.com/uploads/4487208/normal_6008ceeb33ba1.pdf
    • https://cdn-cms.f-static.net/uploads/4485927/normal_600e2f6065172.pdf
    • https://static.s123-cdn-static.com/uploads/4456984/normal_6000bfc41ee36.pdf
    • https://cdn-cms.f-static.net/uploads/4415929/normal_60223eeedbaa5.pdf
    • https://static.s123-cdn-static.com/uploads/4476577/normal_5fdf293452f4b.pdf
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/da73b9b554fac.pdf
    • https://rafutadavo.weebly.com/uploads/1/3/1/6/131637052/a4e4a852f.pdf
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60119e37a73a3.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fe7dddd16b7c.pdf
    • https://cdn-cms.f-static.net/uploads/4448100/normal_600cf22eb966d.pdf
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/juzufukujije.pdf
    • https://cdn-cms.f-static.net/uploads/4502493/normal_604f59e1e5c21.pdf
    • https://cdn.sqhk.co/fonikipen/bg4gefu/diseviled_action_platform_game.pdf
    • https://cdn-cms.f-static.net/uploads/4417658/normal_604f0b2bd2faf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukumesoj/14825995298.pdf
    • https://s3.amazonaws.com/gosete/tefadusukatoxibirul.pdf
    • https://s3.amazonaws.com/gusule/60629978075.pdf
    • https://s3.amazonaws.com/vezumobigodub/zofexejamonagigo.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_off0000ebc8.bin
8bfa663ddb6e46c7cbdd3b053c26165e42e42a78b9cd0b9d066dd3bd8f0cf911		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5272 bytes
font_01_sfnt_off0000fda2.bin
552134c5ddb460e80f5acc35bf01dab659ff5cf408e13a46481e51c378feebce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 10872 bytes

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