Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd1efe7dc0fbc46…

MALICIOUS

PDF

78.3 KB Created: 2021-03-25 23:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6e02eeb971841c5e9b4712a2bdccbb91 SHA-1: e78001bccb6188bef17efbcd48111098a35521b5 SHA-256: efd1efe7dc0fbc4611dc9934a283b778386fc468f76e0a2fc7b021670c7f8093
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a common tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/aws?utm_term=integral+calculus+problem+solver PDF link annotation
    • http://wersita.space/82308023399tc10c.pdfIn PDF document text
    • http://formverifiedbadge.com/when_someone_keeps_changing_their_storyol1l2.pdfIn PDF document text
    • https://cdn.sqhk.co/kirorakoxu/igvUAUL/26377488978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_603eb1ccb9431.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/hjgGgeE/hangout_meaning_in_telugu.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/99344580275it9e4.pdfIn PDF document text
    • http://chisto-chisto52.ru/delegation_skills_for_leaders4v1i0.pdfIn PDF document text
    • http://italywow.pro/2588998652yagvo.pdfIn PDF document text
    • http://in-step.shop/bojategijuw2r.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/46787456937rqyeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_6048bf0dc8d2b.pdfIn PDF document text
    • http://salebox.shop/autocad_2015_crack_32_bit9flr5.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/WAnhdMG/81048708147.pdfIn PDF document text
    • http://makeyourself.xyz/haz_llover_abre_puertas_cielo_acordesin8k1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367273/normal_600380b014ec0.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/jecBuWW/talking_tom_cat_hack_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_604af16252678.pdfIn PDF document text
    • http://copalofa.site/what_games_are_compatible_with_thrustmaster_t150_prol5s1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_913a8ee872fc415d956e6f83c269c801.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_04f2c6c45f6d4e2697a4300f5b117e8d.pdf?index=trueIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_733ea6a4ddc34577905c09e6b4abe03a.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_5cf47f9587d14e0386837d12ba88dbff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9026155-9fa9-448b-b0e0-116aee85d8c9/dayton_gas_unit_heater_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c3dd18-d7ee-4c21-aeb4-8f14ea12dde6/how_to_check_if_battery_is_charging_on_hp_laptop.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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 5392 bytes
SHA-256: db15ef10952a3983b47da63a5615d5daef4e35808da95b5d5bee53d5bb1d8ad6
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 11420 bytes
SHA-256: 0f4a04eb35148cd21a5fc0a812acb91de101adea66f79e7b75994c8846ed6fb3

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