Malicious PDF — malware analysis report

Static analysis result for SHA-256 290fe3e69a68f323…

MALICIOUS

PDF

70.6 KB Created: 2021-01-11 20:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5e1f09b5a8fe3c6897276b881e2a2ba2 SHA-1: e22c21708f7ce3500deb8cc359479b1d9c2fa2b1 SHA-256: 290fe3e69a68f323265488b98558d371895d1ea96ceff9a65526e51e6f87bc69
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to 'traffking.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a deceptive purpose. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to redirect users to malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=slats+for+queen+bed+nz PDF link annotation
    • https://site-1175238.mozfiles.com/files/1175238/21440124089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5fb9f70585a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_5fd1e8197f95f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fe10977375fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_5fb00f346e2f4.pdfIn PDF document text
    • https://site-1204352.mozfiles.com/files/1204352/blackboard_open_lms_help.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fb618bb16fa1.pdfIn PDF document text
    • https://site-1171956.mozfiles.com/files/1171956/pull_him_out_game_level_83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f92e04063122.pdfIn PDF document text
    • https://site-1176181.mozfiles.com/files/1176181/35124108047.pdfIn PDF document text
    • https://site-1168500.mozfiles.com/files/1168500/spinal_stenosis_causes_dizziness.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/cute_male_hairstyles_drawing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fc5db0931839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fb9c9a63c7c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_5fa2b28595f09.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/fasanag/modimanorikisanulebazona.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 5320 bytes
SHA-256: 09153a13f27424398d9f10653f995e206da37be4f45f9a4495100433e2de90c2
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 10564 bytes
SHA-256: 624e661f5fc322170a3697e932e30f326a41832aa1fa3b495c822f8cb4e5580b

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