Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa98790dbaf1d32…

MALICIOUS

PDF

65.6 KB Created: 2020-12-22 19:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e121723f426deadb76375da97296efea SHA-1: d3773c8e17e562d66611fbbb9341dbbcb144ad52 SHA-256: 2aa98790dbaf1d329914dd09ee31ee3b3371a9c4c45494740ddfe845e26e7a09
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://traffset.ru/aws?utm_term=areal+rektangel+formel', suggests a potential phishing or SEO abuse tactic. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://traffset.ru/aws?utm_term=areal+rektangel+formel
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/gojir_jaremi.pdf
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/jarafozuduruzosigupo.pdf
    • https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/a9c9fd7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ec9ae8b3-848b-4241-a584-8a1bcb1951c5/zolobogukin.pdf
    • https://s3.amazonaws.com/medadele/53486863812.pdf
    • https://uploads.strikinglycdn.com/files/8b17d8d4-5a3c-4535-a12c-ebd7f6c39841/64378636349.pdf
    • https://uploads.strikinglycdn.com/files/40161835-0fb0-49ae-8a36-a73f11d5b749/89092659030.pdf
    • https://uploads.strikinglycdn.com/files/8c8d9e74-b1de-487c-800a-4eb48c8489ef/critical_angle_formula_physics.pdf
    • https://s3.amazonaws.com/mubefula/rixugefuvigugogodeni.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_off0000c147.bin
2f5d61f779e79384afd6f29a8ee0ce03ba37834057552450134719dacdab8e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 4960 bytes
font_01_sfnt_off0000d219.bin
04f422f5ac0991561c183f27e3bfe7e076468414b5ae15066befb947f46b0750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 11600 bytes

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