Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f7c99607877db9…

MALICIOUS

PDF

76.6 KB Created: 2021-01-16 18:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 51e7e745aa2fb050b94812e9374ad75a SHA-1: 189a140fbec210f9a1c4befcdc3e8c19e7dc85f0 SHA-256: b8f7c99607877db9cba954c269c2eda0bbaccd1c283f54802fd0f8956578f062
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous external URIs and the link farm heuristic strongly indicate malicious intent.

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://trafffe.ru/123?utm_term=division+2+garage+stash+location PDF link annotation
    • https://site-1176572.mozfiles.com/files/1176572/96899227634.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/5nAOBPy/73175686889.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/Gujg0oY/78258372247.pdfIn PDF document text
    • https://site-1171107.mozfiles.com/files/1171107/fernanfloo_ultimos_videos_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5fe46901d91ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f89948a28026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fb8d28170174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fd85dda66394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391954/normal_5fddcc7f4eb5b.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/Ojcjbhh/wegidasitudixobikufokufan.pdfIn PDF document text
    • https://site-1180062.mozfiles.com/files/1180062/free_az_beneficiary_deed_form.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/aWEjd1t/naruto_x_boruto_ninja_voltage_guide_2020.pdfIn PDF document text
    • https://site-1174864.mozfiles.com/files/1174864/94227420523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f945f721c3b1.pdfIn PDF document text
    • https://site-1172792.mozfiles.com/files/1172792/guitar_chord_sheet_blank.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/hg7Z6uN/find_silent_install_switches_for_exe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 5252 bytes
SHA-256: 022f2c70515a424a50f52b5e1db819139d830bf6c8ac6779ab970fdee4169e50
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 11128 bytes
SHA-256: 2424681ce28293abfc8dde3076d29047e047a06e9e1cde1afb230f3c5617e53f

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