Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d42ca55970f0da4…

MALICIOUS

PDF

92.4 KB Created: 2021-09-18 15:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6e436b11204c4812cc08a1a59a5ff4f SHA-1: 4f0577c7615e4a04ef6239b4e2aeffeea2d8dc00 SHA-256: 2d42ca55970f0da4596064d9dfda9d7cada2d2293e0853dfd9c56da52c0cfb19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of many external URIs suggests the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://laborke.ru/uplcv?utm_term=star+wars+ds+rom PDF link annotation
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/67161785994.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f37958d12---jukemiki.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/lufipilininesuzono.pdfIn PDF document text
    • https://go2germany.ru/files/file/80606777492.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xaposamu.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/17268974969.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/kizatutaza.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/71631905740.pdfIn PDF document text
    • http://grafitym.kz/files/file/fidijijanenek.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/tiforamoxiwazotemu.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/vopanumame.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/24645521043.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/42822551802.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/35210764872.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/xuxisobisasajidekugiwi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/matedamel.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/wexibedirevedebuzezopak.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/desosegiwizuwokugutepigiz.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nebepukenasil.pdfIn PDF document text
    • http://blccy.com/userfiles/files/93240302240.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/58760897930.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/61226458312.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/potomarewuvuvobunajadop.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/kodewasozomuxabepo.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_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10196 bytes
SHA-256: 42ece863cc108fb14f151a3be5d8c5399c68593dc9bb5411eca9c4bfe5434bf4
font_01_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 18092 bytes
SHA-256: 654169f661f47d0797ffc8522c9ed741aa3fd812f46b49480ecb752b6fc5899c
font_02_sfnt_off00014c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1