Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7131893c76df90…

MALICIOUS

PDF

109.9 KB Created: 2021-10-15 07:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60e78c725384945b52d0819f22c1f89d SHA-1: 40e46a0749d2203e3f0502b75818872028108ee4 SHA-256: df7131893c76df90e569d8a78f7fbc31fc382173770c40fdcfd3588c1f2d9765
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs that redirect to external sites, indicating a phishing or link-farming attack pattern. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=hallucinations+caused+by+stress PDF link annotation
    • https://pieseautocomenzi.ro/userfiles/file/16341180802.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/fibup.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/57616119909.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/virusesix.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/93313610449.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/xufugagotegaw.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/lovumirogoromo.pdfIn PDF document text
    • http://budka39.ru/files/25380475665.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/87177964102.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/sisixexobokogowikupaxapok.pdfIn PDF document text
    • http://slipa.site/0429/upload/files/4282937475.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ae184fa43ecb750035c67713b41bc46e/geripinosovapigos.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/84873702819.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/13838183985.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/wijiwaketimik.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/sasubep.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/suwemadadakiwidab.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/6090684109.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_0553ABFFBA6D47D4.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/50775305885.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001472e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472E 19376 bytes
SHA-256: e4b8b4719fd8047b79e5589c818206d3481f43e7cd75591a75510ed26a366d9c
font_01_sfnt_off00017999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17999 10708 bytes
SHA-256: 1c8f0ffcaa77eebe61cf725f61606c3085e3c03d6d214bd7e57f228e6d3129f9
font_02_sfnt_off00019246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.