Malicious PDF — malware analysis report

Static analysis result for SHA-256 92894896e594ba5d…

MALICIOUS

PDF

78.7 KB Created: 2021-04-28 16:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04204b69c08a44b33f51eb70c6bf3268 SHA-1: dd540989fd62ab76a0f302d6859c04ed8f618029 SHA-256: 92894896e594ba5dde0b4dec9766d79e84d934eb0d264cc1862529f302791f7e
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 maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=end+of+the+world+movies+netflix+2019
    • https://cdn.sqhk.co/jawutuwek/jc4iehp/neha_kakkar_songs_ringtone_download.pdf
    • https://cdn.sqhk.co/sorubajuzoxe/NjeVjdJ/80201316202.pdf
    • https://cdn.sqhk.co/zobelekivix/Dic5dLz/zutunalix.pdf
    • https://zidesefaw.weebly.com/uploads/1/3/2/6/132680856/d9206e.pdf
    • https://cdn.sqhk.co/wigalefu/Whbffhi/train_control_systems_market.pdf
    • https://sazobumegeti.weebly.com/uploads/1/3/1/4/131407647/wexixup-zuvep-jovufudaregolo.pdf
    • https://cdn.sqhk.co/rupomotiz/hxEciby/streamlabs_donation_fee.pdf
    • https://cdn.sqhk.co/loxusovi/ahghiia/offroad_outlaws_cheats.pdf
    • https://cdn.sqhk.co/sarodeduz/kcCXiby/carboxylic_acid_notes.pdf
    • https://cdn.sqhk.co/loziromegon/hihhiiJ/49681297318.pdf
    • https://tudaxuvogune.weebly.com/uploads/1/3/6/0/136082380/9928754.pdf
    • https://zoxukumej.weebly.com/uploads/1/3/4/3/134327216/mifowarepenaduwavu.pdf
    • https://cdn.sqhk.co/belesobikezi/ygRamgc/us_government_form_i-_90.pdf
    • https://cdn.sqhk.co/gutifusuf/5jfPrhh/video_game_cover_art_design.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zowejunef/dusagumarog.pdf
    • https://s3.amazonaws.com/pazatuv/kataruroxusifiziw.pdf
    • https://s3.amazonaws.com/sefiwegegagu/free_teamspeak_3_client_for_android.pdf
    • https://s3.amazonaws.com/minabiwa/pepaj.pdf
    • http://rigutogivopum.epizy.com/can_chloroform_be_used_as_a_verb.pdf
    • https://s3.amazonaws.com/dopugaxelelema/what_is_contract_in_legal_terms.pdf
    • http://monufurojebuwod.rf.gd/how_to_make_bookmarks_show_in.pdf
    • https://s3.amazonaws.com/nerugiraxura/46835664843.pdf
    • https://s3.amazonaws.com/gofilafixu/mortal_engines_book_summary.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f627.bin
f878385cf9f10253c41d8fffe78a1d1ac59b7442ec81710eaba929785c1d7de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 5596 bytes
font_01_sfnt_off00010926.bin
dbf8a413eb8e0b17a0fedfe77fd4d660fa4ccd00a35816f4c2d45ab7a0ac6278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 10516 bytes

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