Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d81b5c3e0d8fa9…

MALICIOUS

PDF

74.3 KB Created: 2021-06-02 04:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 61eba037b3ef4bd8f65f94120d9ed983 SHA-1: eafa9392278c5179ea6c0e14e54ec326587759eb SHA-256: 64d81b5c3e0d8fa965ce0a28febca5f6a3d9032da166f92b82d79ffb0e952058
146 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were extracted, the presence of external URIs and the overall detection profile point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/pbw?utm_term=how+to+open+adt+panel+to+change+battery PDF link annotation
    • https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/zoxelevij_debunifimom_noretumimobabe.pdfIn PDF document text
    • https://bekefipupo.weebly.com/uploads/1/3/4/0/134096026/2d89c25d1449e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144484008/kuxovasixapekikim.pdfIn PDF document text
    • http://zikasamu.pbworks.com/f/ejemplos_de_empresas_centralizadas_y_descentralizadas_en_colombia.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/lord_of_heroes_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18b28d1-ed42-4d02-8bc4-aef633b23f16/how_do_i_connect_an_external_hard_drive_to_my_dvr.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/journeys_practice_book_grade_2.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144413940/nonudemom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe38a5c-6d75-4d59-a1c6-5a16b0f4abcc/lang_leav_poems.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144428010/como_dar_robux_en_roblox_a_amigos.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/sokanub.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144446334/the_devil_is_a_part_timer_manga_volume_21.pdfIn PDF document text
    • http://vamafob.pbworks.com/f/4184627324.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144421464/romeo_and_juliet_act_4_scene_1_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b7249dd-4fb0-4568-930e-80ea30d48cd2/monster_vegan_protein_bars_recipe.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/jnc_7_recommendations_for_hypertension.pdfIn PDF document text
    • http://kivupored.pbworks.com/f/left_right_center_tournament_rules.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 5452 bytes
SHA-256: f572af94a56546ff4d4cc9542c25b04569b736202fbe8ec5741ddf1e10a17435
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 11064 bytes
SHA-256: a8f90052b7541ecdc2320b053849698b04bb663739c17c6947d4fed66da38acd

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