Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a430bdaccedeaf2…

MALICIOUS

PDF

90.1 KB Created: 2021-04-29 12:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c937fa8addcde60c3cf580f46c7e279f SHA-1: e1e312d7071cb0aa2a5fde661c8b06d305efdabb SHA-256: 7a430bdaccedeaf2be9331609b11da7c534a2a3715521a6ad4ee6c49bb3db40c
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of an advance-fee scam. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://kuzutuzo.ru/strik?utm_term=the+unwanteds+book+6
    • http://lipexifinidoda.scienceontheweb.net/5597154650.pdf
    • http://soldonlittleton.com/what_is_kronos_time_clockr3rs8.pdf
    • http://decideyouself.fun/samsung_music_player_old_version_app_download2okqt.pdf
    • http://regsenatvumen.website/194387264815tqa.pdf
    • https://cdn.sqhk.co/firataxoworo/iagc8gi/data_sheet_2n2222n.pdf
    • https://cdn.sqhk.co/vunalogivefu/lY6Pwhh/shaolin_kung_fu_academy_surrey_bc.pdf
    • http://abanca-electronica.com/52481241861pl49u.pdf
    • http://pro-konditer.com/67984429707yy0od.pdf
    • http://kinerexasuxemo.getenjoyment.net/shrink_file_size_online_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_20f3edbe1c7445a9a6d2e06bb54de606.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e8ac8bd-5318-48db-9dcb-4aa066aa9a72/54897794735.pdf
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_c27d38bde94c4e90a3f681322a896eb7.pdf?index=true
    • https://s3.amazonaws.com/nijudow/86150871313.pdf
    • https://s3.amazonaws.com/vixuwogetiv/capability_gaps_analysis_template.pdf
    • http://mepitar.atwebpages.com/43289679552.pdf
    • https://uploads.strikinglycdn.com/files/b7876c7b-09aa-49de-8dfd-2bd41e7a1189/hp_color_laserjet_cp4025_black_toner.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95e.bin
58127fa5b59c1f3c25cefc57f300576fed25cbca60d090d6153834852c990a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 7544 bytes
font_01_sfnt_off000112a7.bin
5766eeef0fbf08e6602e28c7cfa5d305864b2fdbe89bf782e74b64e7e07bf386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 5020 bytes
font_02_sfnt_off000123bb.bin
8ef418064f3ffc855c667f9f80bbe39912acd4bce9b69119a5190341304c6667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 12236 bytes
font_03_sfnt_off00014cff.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFF 4324 bytes

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