Malicious PDF — malware analysis report

Static analysis result for SHA-256 40995a70c5466398…

MALICIOUS

PDF

75.9 KB Created: 2021-02-28 11:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 17bfab43cea17a07d7b9dee1f8066b82 SHA-1: 78d52275447c4587799279a6d022ddceefd82515 SHA-256: 40995a70c5466398771fc50d621147ff05362e36725b796e5888900c6a7aa935
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or distribute further content. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest this document is part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9264

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/strik?utm_term=acer+nitro+5+laptop+gamingowy+an517-52 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fceae5dad14c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_60288ad97ed8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5ff66491ad142.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/qRLii0S/65748418053.pdfIn PDF document text
    • http://reawolt.online/poulan_pro_blower_vac_manual0jrt1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc6b6d1d629d.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/zaden.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/28208795854.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/xujalogejorar.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/bebixagajedamolibuwukafu.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/jenevuxu.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/enchanting_minecraft_guide.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 5680 bytes
SHA-256: 07a13eb747234f0aeac5b0fd7b59a32502e8c5a2a893fa562582ea67baf7af30
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 3252 bytes
SHA-256: 165f6d3b40573ccab9df77356aaef3c42daae4b490570b53333646c2b3afce31
font_02_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10252 bytes
SHA-256: 1b973db1536c770e321fb6eef81831c38ea106cb2aace986bd1296c4a5cf4ca8

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