Malicious PDF — malware analysis report

Static analysis result for SHA-256 2672c2de4d8ae517…

MALICIOUS

PDF

72.3 KB Created: 2021-04-07 11:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b53f16a6e2f46e691633cc08d7ee4ef0 SHA-1: 21137b65c8b1b60b32920c2e11c8f4bb9a9a35b7 SHA-256: 2672c2de4d8ae517e6bf3ce13ae891663c108607971c30970c410309c41ba2ce
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one prominent URL pointing to 'seumenha.ru' which is associated with a slither.io keyword, suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=slither.io+unblocked+77
    • http://xosopinogagon.iblogger.org/44999834634.pdf
    • http://fuzubijixulux.mygamesonline.org/angaaray_book.pdf
    • https://cdn.sqhk.co/lajoroteb/hjAhdGm/anthem_lights_in_christ_alone_free.pdf
    • https://cdn-cms.f-static.net/uploads/4421641/normal_603e8cd3360f3.pdf
    • http://fufejezonodim.mywebcommunity.org/ganaxanedowizidemogo.pdf
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5fef95f29c600.pdf
    • http://tufodudem.mypressonline.com/tutorowebizuduvukubikoxo.pdf
    • https://cdn.sqhk.co/lobinazema/KajbSic/rolly_legs_uptodown.pdf
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5ff27209aa23d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gekekuvowu.epizy.com/regional_anaesthesia_textbook.pdf
    • http://bikikifuxax.epizy.com/kopam.pdf
    • http://xefivaz.epizy.com/veberaf.pdf
    • http://siwojab.epizy.com/bidayat_al_mujtahid.pdf
    • http://xowobovu.myartsonline.com/jonudovaninigonuxadazurin.pdf
    • http://midelex.epizy.com/gibutazutubenepavi.pdf
    • http://refusunono.onlinewebshop.net/gugovewolebewinomovusuv.pdf
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_cef89bf02ca449d7b8bfcd69acc42adb.pdf?index=true
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_0bc6132c17244bc6a931e6d4dae0b541.pdf?index=true
    • http://binasizula.rf.gd/gukon.pdf
    • http://ximuruguj.epizy.com/circuit_switching_and_packet_switching_difference.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d093.bin
8d85f65b5560b7fdd2cf45b1a7a725af4e613b394ef1efb7cb5a116381d929c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 4940 bytes
font_01_sfnt_off0000e157.bin
941d280a73a8e95f74573ba8566c4ce55d0170a09c40f21e06f546a94c626ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 10772 bytes
font_02_sfnt_off0001058b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 4324 bytes

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