Malicious PDF — malware analysis report

Static analysis result for SHA-256 49934f0eadad9711…

MALICIOUS

PDF

81.6 KB Created: 2020-11-11 20:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fef2a5188624426761121aedf262ea4 SHA-1: 7715201a446d2ed1e20d90d79366686b48f3a1eb SHA-256: 49934f0eadad9711cb6392c5bdcf50de2e7203054864bac8f2220d931a6b49e7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external links, with one prominent URL pointing to 'trafffi.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/strik?utm_term=asus+vn248q+p+review
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f917e3373d40.pdf
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f9300ef65ab0.pdf
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/natubanewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d555ba5e-77fc-4266-9b36-06c9aee21677/lexus_is300_service_manual_downl.pdf
    • https://s3.amazonaws.com/luxelula/98583482621.pdf
    • https://uploads.strikinglycdn.com/files/a71a5632-1252-425b-91a8-7513aea2c2eb/gabewikawalobaxo.pdf
    • https://s3.amazonaws.com/gaxuremewuger/suvifokeratarosemat.pdf
    • https://s3.amazonaws.com/fapaga/minecraft_lego_instructions_21141.pdf
    • https://s3.amazonaws.com/ruzaganog/working_principle_of_autoclave_machine.pdf
    • https://s3.amazonaws.com/lebaxa/maytag_neptune_owners_manual_download.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f286.bin
6ce655dd5c7e00439563b058f6ad365cb675307c6d2afa9ca574b412fc5822dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 4944 bytes
font_01_sfnt_off0001036d.bin
1cee10c1cb55951a7377b7f5b78de54db379eb23b017faa49ac6abae0ef1f9fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11728 bytes
font_02_sfnt_off00012b88.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 4324 bytes