Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff64d1c524ebf20d…

MALICIOUS

PDF

75.6 KB Created: 2021-02-24 20:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ca77688169e2a1a116488c7a3cd5aee2 SHA-1: fe342c3817fa81d6c15379956d433d004d3eab0a SHA-256: ff64d1c524ebf20d4019ebb8f8d8a37e52e4d27b6c7109e5f70e2f4dbf4aeeee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are configured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=does+cuisinart+have+lifetime+warranty PDF link annotation
    • http://fito4ka.xyz/munaranekeviwixojusaragukyj3k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff328b80be0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_601c61cdaa0d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422877/normal_5fff9a1fb4545.pdfIn PDF document text
    • http://malespw.xyz/6789532415586420.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/jaVihx8/pressure_washer_pump_parts_troy_bilt.pdfIn PDF document text
    • http://chempion.coffee/etica_como_disciplina_filosofica14ej7.pdfIn PDF document text
    • http://static-start.top/83606721406px2yc.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/7RgjhdJ/alien_shooter_app_guide.pdfIn PDF document text
    • http://mon-compte-cmb.best/how_to_use_the_adt_remotemugzr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_6015db06cfef0.pdfIn PDF document text
    • http://bestrongbyg.com/xudutisison8rp4i.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/icjgif5/nelozaxetogilamosadevure.pdfIn PDF document text
    • http://topuniversityru.fun/basement_car_park_design_guidew2iwu.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/xgiihih/grade_10_history_world_war_2_test.pdfIn PDF document text
    • http://allieshouseofhope.com/85952289168wnjdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_602517aa0f84b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vojapu/fedurewojenozivuwama.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/samusuril.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/85394707073.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_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 5372 bytes
SHA-256: a21c459c192ce24ab98d7de9f3771f9b136cbbe6184b5ffde3b3ceb1b0d9438f
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10900 bytes
SHA-256: e2dead2e0dcf099533a2d6006b1776b891c80e9c2b12353974b22f7d28ce904f

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