Malicious PDF — malware analysis report

Static analysis result for SHA-256 01541f79206fa439…

MALICIOUS

PDF

79.7 KB Created: 2020-12-30 00:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 188634c2a404627c67ba0e8a0b26c0a2 SHA-1: 1facbbb2f203a6cfc35d8c7645ce7b6bb2b9e90d SHA-256: 01541f79206fa439e661c989a8ab8d7530d3e69fd90f297f0ef9411649ee2e98
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic firings reveal it contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=complex+variables+laurent+series+examples
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fb3743539fdc.pdf
    • https://cdn.sqhk.co/sufipuxifemo/QgeEQja/53483084564.pdf
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f8bbc91739b8.pdf
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/f9382240bf5c7b.pdf
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5fab284ee275c.pdf
    • https://cdn.sqhk.co/vipabure/PzgijeI/minecraft_camera_studio_mod_1._14_4.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/gafupuzepaxitevero.pdf
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f943526ecf5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukujidor/etre_present_tense_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/bb9cd139-35e3-411b-852d-5130017e3732/rolofejaxagowujiku.pdf
    • https://uploads.strikinglycdn.com/files/621aae6b-c33b-4250-96e4-5827deeb548e/sent_fragment_and_run_on_sent_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/e2741fe2-774d-4dd5-a8d4-9b0552c1c5fb/74245355923.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f1.bin
c7b2f5dfae5bf7fec12a51576e3a27c8415dd7dc2efc5f2580b2c8f55cf114b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 5140 bytes
font_01_sfnt_off0000f24c.bin
314b0be3943a2009652846a1116be8b0401e8252e512fe5721503a58fbb513ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 12104 bytes
font_02_sfnt_off00011bf3.bin
caa3702702e645073636c4f6d1a08ed4d37b43d6f2023ac58ce03c53828de207
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16300 bytes