Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9c5de3b1be30d1…

MALICIOUS

PDF

77.1 KB Created: 2021-01-17 02:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 92887445b0bf9ba176bbe6b38ce33f37 SHA-1: c61d383c3195d575631a22e73b150089a65f4036 SHA-256: 6f9c5de3b1be30d1f3dbd9a26937802d8430753c7ca63e5aa99ed03642e6083f
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains a large number of embedded external links, a common technique for SEO farms or phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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://traffnew.ru/123?utm_term=2000+g+to+lb+and+oz PDF link annotation
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/xawofumadu.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/dalodekenobibopike.pdfIn PDF document text
    • https://cdn.sqhk.co/gogadibavuta/NgggjKG/outbreak_translation_in_arabic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fefe5699f077.pdfIn PDF document text
    • https://cdn.sqhk.co/xukerejolar/ihPgdgi/packers_game_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_5fe93b622d6d1.pdfIn PDF document text
    • https://geperibikabagop.weebly.com/uploads/1/3/1/4/131409385/5d457bc2845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382949/normal_5fe5dfcb62a38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404529/normal_5feb9cd473e63.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/2201977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_5fb7972db9615.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/kokesatodixon/baofeng_uv-_5r_svensk_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/salary_arrears_request_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/nixovasewitubaxabo.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/98991837657.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 5088 bytes
SHA-256: 77e9343a5271f6c9bcf7f3e2c04151c64fc2c26d4e602070b80b9f591771e277
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10912 bytes
SHA-256: 82e96f8ca240fee21e913bac6f05f0aff47489150c378ae390db2779eb7926f4
font_02_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 16216 bytes
SHA-256: 871b4095fc7c041a203291fca2bd9aafe616cebda300aa375dd8488bbeff23d7

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