Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e1212a879abbff…

MALICIOUS

PDF

88.0 KB Created: 2021-03-24 10:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe7db78b859e9fa339c356cdc89c2506 SHA-1: 8fd8f03349d06b294e60ff746d9c035163ad6a96 SHA-256: e9e1212a879abbff20203346850e9e66b0c1416aa1254378887fff035caa7e89
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://resalured.ru/strik?utm_term=nikon+or+canon+cameras+for+beginners PDF link annotation
    • https://cdn.sqhk.co/nepodowu/Blhdsha/73271911976.pdfIn PDF document text
    • http://cardioactiveuficiale.site/fukotavurupekeragevukeba74elz.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/Jugejac/wenoxexejul.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/jcmDpbZ/codigo_penal_comentado_guatemala.pdfIn PDF document text
    • http://bilkaita.space/93172909988ma45v.pdfIn PDF document text
    • http://hackins.site/how_to_remove_battery_from_apc_surge_protector2kkev.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4446499/normal_60358032db73f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_602c474e766db.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ljggigj/legewi.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/dgddjav/at_t_pagar_mi_factura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_5fd9048738071.pdfIn PDF document text
    • https://cdn.sqhk.co/midusuworab/hhzoLij/tekuxekabi.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/93hbcjg/ugc_net_anti_ragging_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_604055933c1ea.pdfIn PDF document text
    • http://marojuburegorad.22web.org/the_essene_gospel_of_peace.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/fPhjihG/what_time_does_nascar_race_tomorrow.pdfIn PDF document text
    • http://xebobimifu.22web.org/net_exam_2018_answer_key_paper_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468554/normal_5ff7aa24a60c6.pdfIn PDF document text
    • http://barbanapoli.moscow/onkyo_tx-nr616_no_soundhp06d.pdfIn PDF document text
    • http://bilkaitaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufegojokod.epizy.com/die_aufklrung.pdfIn PDF document text
    • http://nenunosulijud.rf.gd/free_font_bebas_neue_light.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/acls_guidelines_for_defibrillation.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/84743599145.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 5340 bytes
SHA-256: bfbeb0b5d691c027636715ec2854882c428eb9c3bff0fe20c6445b91f8d84d2f
font_01_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 11184 bytes
SHA-256: 3659ccac77c632c4e0b56b2dd497590f898d6114dc9f52d70cd21249ad22ce44

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