Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0560be1c0337422…

MALICIOUS

PDF

60.9 KB Created: 2021-01-12 17:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 37abde7d1fe9f0350fb45aec90d04ced SHA-1: 5a77b9cb1e257e8ae3508a915e6b453b5f30a098 SHA-256: d0560be1c0337422864fe4a4862c38b4fbf70e04cc0496b6f861c2ad0d23f7d0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one specifically pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffe.ru/wb?keyword=jump%20on%20it%20song%20remix PDF link annotation
    • https://site-1191354.mozfiles.com/files/1191354/giloji.pdfIn PDF document text
    • https://site-1175983.mozfiles.com/files/1175983/noviduxiku.pdfIn PDF document text
    • https://pasadaxadug.weebly.com/uploads/1/3/5/3/135390708/2c80eccf58988.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/dudojepasugoki-jezera-luzigitifetig.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/diwudalemedezuw.pdfIn PDF document text
    • https://febefuso.weebly.com/uploads/1/3/4/3/134382796/rozaxorufimodobodu.pdfIn PDF document text
    • https://site-1178419.mozfiles.com/files/1178419/e_with_accent_aigu_alt_code.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/fidefofudi/joint_venture_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/bowegapowutimen.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/subway_surfers_apk_mode.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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 4956 bytes
SHA-256: 521d50e8bfa2ee0fbf0e88d65cc1658b3866a5646d78af56fde7dd9a8a87c7db
font_01_sfnt_off0000c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 9628 bytes
SHA-256: 91e4cf2e202d39e7fae55e3b8f5eb6f4e9adf597336e76a1b4f7e914832e88c5

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