Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f848f11d58a2db…

MALICIOUS

PDF

82.4 KB Created: 2021-03-15 22:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 732eeb2503444b9f42403bbeb581cf00 SHA-1: d5a7c606799ff6e4cfd3ec7a52cee3a4729e25ba SHA-256: d6f848f11d58a2dbc1e3513967b3b7626c18234787c87d5f29d1601fb3def139
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+happens+in+chapter+1+of+the+giver
    • https://cdn.sqhk.co/rajemaramiw/eqnTfhg/95829714282.pdf
    • https://cdn.sqhk.co/rogumabutur/hhJOgdq/ff_live_stream_total_gaming.pdf
    • https://cdn.sqhk.co/veludewozen/2gdjggg/waguna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jigabez.epizy.com/ar_15_handguard_attachments.pdf
    • https://s3.amazonaws.com/xukonakefules/fapekutaxu.pdf
    • http://betupaxomivokab.epizy.com/context_clues_3._7_worksheet_answer_key.pdf
    • http://xeratulawasof.rf.gd/11511472311.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_967e06afecb44c329504907ea789a821.pdf?index=true
    • http://bamemuwibe.epizy.com/nims_ics_100_questions_and_answers.pdf
    • http://dogivazisuj.rf.gd/what_is_the_sandwich_method_in_offering_constructive_criticism.pdf
    • https://s3.amazonaws.com/gulapore/86465753438.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/rerovejusapu.pdf
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_12b8a576d47f4a448f2c71a693b94333.pdf?index=true
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_32bee9819d484dd692e8e573b62116e1.pdf?index=true
    • https://s3.amazonaws.com/lebejos/9555174079.pdf
    • http://diwuzenebixo.epizy.com/cost_of_bowflex_xtreme_2.pdf
    • https://s3.amazonaws.com/vatakefojunib/free_end_credits_template_sony_vegas.pdf
    • https://s3.amazonaws.com/fojaxexino/74949733385.pdf
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_cc3dbad98ef645c3b2a62fd658d7b88a.pdf?index=true
    • https://s3.amazonaws.com/tenunud/nothing_bundt_cakes_confetti_bundtlet_nutrition_information.pdf
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_8d6ed47f90504687aea138fa477dca0c.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f785.bin
f9f2e35877e3a472396c9cd4740df0ab183079e1d7d1a3d136068ac2304c571e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 5160 bytes
font_01_sfnt_off0001091d.bin
6b7e5d0b0d73b0a36caf03a04b3ec9f8733e261fa10673f028a9eedd8145a34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 10680 bytes
font_02_sfnt_off00012da2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 4324 bytes

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