Malicious PDF — malware analysis report

Static analysis result for SHA-256 104f382ad2a14731…

MALICIOUS

PDF

73.4 KB Created: 2020-12-28 02:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad1b10a1858b54ca6a511097bfd741ce SHA-1: 1d3c4ebc333d1d4e87902e0ad891d84e626242d3 SHA-256: 104f382ad2a1473165ba07d8a6a70fac5abdc8b152d4505bc0b8f2d368ea568f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also flag this file as malicious. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=giovanni+leave+in+conditioner+spray
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/9fe0b.pdf
    • https://cdn.sqhk.co/gadukupuwe/c4ifhiU/1079936130.pdf
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5fd0785be2393.pdf
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5fbe1a77d8745.pdf
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5fb40d1c1a620.pdf
    • https://cdn.sqhk.co/revikokelobu/SGhf0Y6/city_racing_lite_hack_mod_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5f873bb655c1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeromopelurab/2020_federal_income_tax_estimate_due_dates.pdf
    • https://s3.amazonaws.com/boduxatavepe/autocad_2014_lisp.pdf
    • https://s3.amazonaws.com/bitajemisajoz/32138761807.pdf
    • https://s3.amazonaws.com/virumutipalis/46240000810.pdf
    • https://s3.amazonaws.com/novipaliwid/chicago_bears_schedule_2018.pdf
    • https://s3.amazonaws.com/nuselufuzo/97273893065.pdf
    • https://s3.amazonaws.com/sesafefanulokam/polawujukilovikuponawudet.pdf
    • https://s3.amazonaws.com/xurixado/54936971474.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21f.bin
09e26c1bfcac401fd0393c1bb87163d723be47931fd69feea6d1392776d073aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 5260 bytes
font_01_sfnt_off0000f422.bin
9c76840dc962729fc1a0ba0980c35104bb86a89b0bb44b4199d29fe91483b255
pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 10692 bytes