Malicious PDF — malware analysis report

Static analysis result for SHA-256 23de01243e8dd0fa…

MALICIOUS

PDF

65.4 KB Created: 2021-02-25 09:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c6e2eb514d14c2bd6a6493f8e05c6827 SHA-1: 74739f14ef82a4f6dd9a60d7ec1fa154c1f5557a SHA-256: 23de01243e8dd0fa03a8b742db161195e8e645573c5a95c073febf9c93792764
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier further indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8766

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://crophysi.ru/award?keyword=baby+jogger+city+mini+gt+accessories+nz PDF link annotation
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/resagesegubuji_tipajug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_602d8063751a7.pdfIn PDF document text
    • http://legiontry.online/9076506324gzsgl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_600628cccf52f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5ffa1231613da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5ff77aacf17be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_6026fa31de7ff.pdfIn PDF document text
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/bd202d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fe13230ebdfa.pdfIn PDF document text
    • https://budozawepolok.weebly.com/uploads/1/3/4/8/134852557/saviretugalilel.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/53jbahc/pancake_recipe_gluten_free_rice_flour.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/39e0a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_600b3a63ac37f.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/wovitiku/jadupirirutizorili.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 5504 bytes
SHA-256: 39f4d79a27a4b157e1a2c2e4fa98ff43724e1957b312cd243da1427bc4bc2187
font_01_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 11132 bytes
SHA-256: 4b5b04ccd5acac1dbcfa64fb52044313600ca7fb4ab2552671a753d7050ad4fc

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