Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55afcaf52c4c975…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 01:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a5391cd90b80075ece203c0016d17c33 SHA-1: 8fd77c03ea392a30609ae0dac7d6c3aa683dd73e SHA-256: f55afcaf52c4c975c51ce30dd3809b6d6def3d20fdb160565de9cf56e99f7fa1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains or link farms, suggests a phishing or malware distribution campaign. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=me8391+engineering+thermodynamics+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/sujubowip/cBhchbt/the_walking_dead_season_2_game_guide.pdfIn PDF document text
    • http://leomannapov.com/79653201644urqc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_602149346e76e.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/mawuxakjyia.pdfIn PDF document text
    • http://gbo.guru/how_to_program_xr2_remote_to_element_tvompna.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/12925036775.pdfIn PDF document text
    • http://polnews.xyz/14022928116kvrst.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6035a28dc88a4.pdfIn PDF document text
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/nenapumupupaf.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/how_much_do_mechanics_make_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/YSxSihd/pelejije.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/jPamIgi/tropico_4_cheats_code.pdfIn PDF document text
    • https://cdn.sqhk.co/pewovixosafu/gPRiaPi/photo_frame_collage_app_download_apk.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/smart_calling_art_sobczak_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fce0feca64f2.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/pavefivaruwifutivimak.pdfIn PDF document text
    • https://cdn.sqhk.co/pubabolab/hgigjih/64226532131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ffd4ba1ec1cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/5636322663.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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 6208 bytes
SHA-256: fc4afd33a8e22fd014c32cc094f0dfae884880c091d16f36402698ca72f16f75
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10440 bytes
SHA-256: af4021771b92d7733636cc795d825dd68726b56ab5f1c76971bc9ed6300fee7f

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