Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3d4d16c2950ebd…

MALICIOUS

PDF

65.1 KB Created: 2020-11-10 21:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c19d16ad8810d7a1b28d7692243bf724 SHA-1: ddc059368df3668b2c5c00b8c707de16f94cfe7c SHA-256: 2d3d4d16c2950ebd23213e1c8756fe0daca4029da78dac33e5b2098779db852d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, with one identified as a 'PDF link farm', suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs points towards a phishing or SEO spam campaign.

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://trafftec.ru/123?keyword=2017+isuzu+npr+hd+owners+manual
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/mitekerebisoxubu.pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f89e94f30457.pdf
    • https://tozowibalap.weebly.com/uploads/1/3/4/3/134383498/1715818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xovajukoxin/music_ids_for_roblox_royale_high.pdf
    • https://uploads.strikinglycdn.com/files/6c980888-e2bc-4d2f-979d-ec25e3214373/17561880383.pdf
    • https://uploads.strikinglycdn.com/files/2a030ea6-7da9-4fef-a4ec-6e1c6d5cee6e/viragabobufexezetu.pdf
    • https://uploads.strikinglycdn.com/files/a48753c6-3e51-450c-a9be-10bf1ae40857/woboj.pdf
    • https://uploads.strikinglycdn.com/files/814d857b-bea2-4f08-bdf3-82f2de2c0403/vagaputesopijesobapig.pdf
    • https://uploads.strikinglycdn.com/files/48b77fbc-b7ba-4662-8229-ed4a62b4624c/vemefotikisano.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_off0000bf54.bin
33c3da3ad5ce3def418c8e37d1db23b36c265a0407772264d947a46387011c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 5652 bytes
font_01_sfnt_off0000d285.bin
c57b7ddadc958f4890f0ef209d418a5223e489f27f77810c4e8c0c9dc65b965d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 10960 bytes

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