Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f2e36c789a4a37…

MALICIOUS

PDF

174.4 KB Created: 2021-02-15 03:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b7ffe8e21364318f91c36f13ce239bf SHA-1: 2340e5bea7a80685c6c689a8f769c02928adad11 SHA-256: 10f2e36c789a4a37a985ec28610ae545f59e582d39c2b14eedc905a4299b9bc1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a '1967 camaro assembly manual', directing users to external sites. The presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content or phishing pages.

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://bologen.ru/wb?keyword=1967%20camaro%20assembly%20manual%20pdf PDF link annotation
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/tupag.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/ggcvMig/f1_manager_strategy_series_4.pdfIn PDF document text
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/walalelekiw.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/pirelugedolufag.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/ZBKifak/58093345785.pdfIn PDF document text
    • https://cdn.sqhk.co/nudizodi/HNibifg/96721815164.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/Qjg1hcr/fukesebokovewuna.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/72geXhe/translate_romanian_to_english_voice.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/7410909.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/gdHhegj/escape_alcatraz_triathlon_sharks.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/guxomilub_kuwifuri_ladal_pojowaxo.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/borafunonako.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/bededuxotulapil/29716451639.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/zakitu.pdfIn PDF document text
    • http://rafubapon.epizy.com/30441697376.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_off00025b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B85 5892 bytes
SHA-256: 2a7a5048adffbb7bc8ac4c62ea8c579314e01973ef00fe44f473c6789a69aff6
font_01_sfnt_off00026f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26F7D 19884 bytes
SHA-256: 10f4124df6bc48fe610d7cd9fd0fa93d7f1a19216b93943480e6b2890a2efa1f

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