Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c096363af7203e3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-19 04:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 522b324e451b512b14eb4544512c2d4e SHA-1: 1b904fe613bdc64d832ef24dbe1cb24546a744ff SHA-256: 7c096363af7203e341416c18edd1058efb39c37eab72994f0f77f11cbb8680c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true malicious destination. The primary malicious URL identified is vilenefex.ru, which is likely used to host phishing content or distribute further malware. The document's structure and embedded links suggest it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=horizon+nj+health+provider+list
    • https://cdn.sqhk.co/doporaba/Egdgdhg/kasobalaniredifewadaba.pdf
    • http://greatholl.com/the_light_fantastic_amazon4h69h.pdf
    • http://test123test.xyz/witukufagofejitefowobeuthfs.pdf
    • http://thelandofbadideas.com/89324753182gs37t.pdf
    • https://cdn.sqhk.co/wibafozadil/jehghgK/kof_98_um_ol_characters_stats.pdf
    • http://totalcreditreport.info/917383737207xcg5.pdf
    • https://cdn.sqhk.co/jawutuwek/W1hg8Br/full_steam_ahead_book_review.pdf
    • http://xrootunited.com/reglas_de_acentuacin_agudas_graves_y_esdrujulas_y_sobresdrjulassyhnw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_c8f2df138c434ef4923e979724a8cd1f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/271a2d8c-8539-49b1-98e7-6dd04d4bf34c/washington_redskins_name_change_options.pdf
    • https://uploads.strikinglycdn.com/files/8b6513da-4b4c-483a-9c31-c8847ca85fbd/dogokawizesekuxanujeli.pdf
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_6f87342dead449688e4f3ff556aa3cd2.pdf?index=true
    • https://s3.amazonaws.com/vipuxafol/70375752317.pdf
    • https://s3.amazonaws.com/kefefetafij/garmin_rino_650_update.pdf
    • https://s3.amazonaws.com/tanikanaw/91251054588.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/14089250992.pdf
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_5456d665f7f5450a908d81d9a9f7cb36.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_9361f573fd54440497c8ade673027a21.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/defukadezozisajawo.pdf
    • https://s3.amazonaws.com/vavabi/92316349850.pdf
    • https://s3.amazonaws.com/zumomasugipeno/vpn_free_for_windows_10_psiphon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e8.bin
fa6bb6740a48128226fba21cdb46ea75c2eb3a184dbcb1b896cd7263ebf12238		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 5196 bytes
font_01_sfnt_off0000f597.bin
c4b0154f7a46b90bdc4a5cb9dd3088e2d8ff37a8026607d4638212fbcafa3c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 10924 bytes

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