Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7a8e191b84ba0c…

MALICIOUS

PDF

65.7 KB Created: 2020-12-16 01:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cd7d732f8752cba1574180148d01d0ab SHA-1: ce5a630543479d0985f9297e21eea0b208d538a1 SHA-256: dd7a8e191b84ba0c43809c0ed59d4ee88fa91ac6cf91f2d05804beee0d909b54
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and references "Gold's gym 290c manual", likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=gold%2527s+gym+290c+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5fcb9caa325fa.pdfIn PDF document text
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/91294264c3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5fc9cb81cf2fe.pdfIn PDF document text
    • https://lijasefevofik.weebly.com/uploads/1/3/4/8/134889997/gejubetosedosezuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_5fd79e8612481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5fa91241634b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f990e0c614a1.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/415073.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/zikeko/harris_benedict_formel_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/simple_logarithmic_equations_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/monusumofigonip.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/crusader_kings_1_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/vikiwudilimuwig.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC386 5760 bytes
SHA-256: 27b91336e1c54b8bd63cd75f2d2e506f59966cb878d1b199404071645f462e0a
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10336 bytes
SHA-256: a211281e8273c6cf5df2211d093989804064de5e64483206ef666d78569d5a85

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