Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ccda3652e9d663…

MALICIOUS

PDF

75.9 KB Created: 2021-03-02 20:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9d0bc95370c6ab82f6fc8cfd7585c4e7 SHA-1: 5c525d483da0cc9f5ebe84b549ba25708d6c6c2b SHA-256: 81ccda3652e9d66300178cd4c29bdf0d708ee6e2e8a91c1294b2d7693a0ef466
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The embedded URL `https://leonvi.ru/award?keyword=how+to+charge+sharper+image+wireless+earbuds` and other similar URLs point to potentially malicious or deceptive content. ClamAV detection as `Pdf.Phishing.Trojan` further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://leonvi.ru/award?keyword=how+to+charge+sharper+image+wireless+earbuds PDF link annotation
    • https://cdn.sqhk.co/bejamisokepu/OOmfgfU/glyphosate_weed_killer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fe5e2d0c94cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500432/normal_5feb199b9b694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_600b575c172d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408709/normal_5ffb46e63cbb6.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/hhJVgiA/42546318796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5ff57ae625fa4.pdfIn PDF document text
    • http://digitalmicroteter.xyz/52551369634nix3z.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/3c3e68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/73726272974.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 5680 bytes
SHA-256: fcfd83f6ac299c8ccb4e5169816ca35b854c4062177545611df4a3b29f422d62
font_01_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 10428 bytes
SHA-256: 32f00b444fc9ee049a2dd489d44a512cfc96513c65576f8d5140d037a1087667
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b

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