Malicious PDF — malware analysis report

Static analysis result for SHA-256 9814b4b4ab3d7c12…

MALICIOUS

PDF

66.4 KB Created: 2020-11-22 01:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c93965c1c06aa496905860c247dc77f SHA-1: cc6f0a7198d3c3b456c821f17867b620c183f2d9 SHA-256: 9814b4b4ab3d7c12a50d6db7539effaba33f239c2246ef1b573cce061585851f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to manipulate search engine results or distribute further malicious content. The presence of an embedded URL and the overall structure point towards a phishing or SEO-based attack, potentially using JavaScript for execution.

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://trafftec.ru/aws?utm_term=the+brothers+karamazov+audiobook+free
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f9a094f6585a.pdf
    • https://komolelavox.weebly.com/uploads/1/3/4/5/134518501/pizofozik_difup_vibekixilime.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f8c0e22c8efa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jebupofedijakuk/social_media_marketing_2016.pdf
    • https://s3.amazonaws.com/gapivegek/gu_portal_result_2019_marksheet.pdf
    • https://s3.amazonaws.com/susopuzupure/mifivumaruj.pdf
    • https://s3.amazonaws.com/loxopudizus/4311888971.pdf
    • https://s3.amazonaws.com/jazuravazaguz/41475304535.pdf
    • https://uploads.strikinglycdn.com/files/e04b55ce-d4b2-4dfb-9c16-02616ef0fee0/bogegorenotikasowubox.pdf
    • https://s3.amazonaws.com/sabobenuwe/lafojasi.pdf
    • https://s3.amazonaws.com/fukezavazuj/kumiwadunetafosawudesupa.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_off0000c91e.bin
6159c6d5e806809874bf9bcd3eb9d5f01c4fd883fe6ee683a5189db865ac3529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 5376 bytes
font_01_sfnt_off0000db44.bin
06ba6b6fc421ffbdd155bc563deed1b6a8d70d0667231753b32aaae9699bf02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 9816 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.