Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce391277a8cfb59f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 23:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c69903944f793676f5c5567e3740ed74 SHA-1: 9672905a02da36ff1b270ca8824f59249bd1d4d8 SHA-256: ce391277a8cfb59f2c9bf4f430fa13223061898e1c52023a5eab0dce7e5caf69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with multiple external URIs pointing to potentially malicious domains. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=debug+phone+chrome PDF link annotation
    • https://tckontrola.hr/files/vojakijiwokufozozudibe.pdfIn PDF document text
    • http://safetruck.gr/images/file/kinakevupadufof.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b4e586d---semekoxegejeridilejutew.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/bolibo.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/jaxurejenuzepomade.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/71fbf24e983ffee266398f7f72871104/getubawaxuramadozope.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/28532997396.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/tepusole.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fulonagufolisuguvigetaxix.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/26378398889.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/76912799576.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/75865350906.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/34400124697.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/61424498712.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630962985.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/sesebena.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/7040252024.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/solulojemopo.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/95142127931.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/8556049902.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906140109.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/72176763122.pdfIn PDF document text
    • http://zamgph.com/uploads/file/040853452894.pdfIn PDF document text
    • http://foxadv.net/file/koxiwokajurerakepu.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_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 17612 bytes
SHA-256: 6b0243d0cf712fb61ccc0c88ef18d2737e254983cee5273be501455cc7b0afd8
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10496 bytes
SHA-256: 74b4cf451124570815eb8616fb770efe922986955298dbb7fc6efb7c0cc45e86
font_02_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1