Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f55add404d06e84…

MALICIOUS

PDF

85.4 KB Created: 2021-04-04 16:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c34fa86c62251cfdf17eb8f458b15292 SHA-1: 53f07bcb545115a9e363679562d06f4302f6f6db SHA-256: 3f55add404d06e84812e80b108685a3216743e8ed8dad3466c2f4b05ceb6a5bb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains references to 'file to pdf merger' and 'wkhtmltopdf', suggesting a lure to disguise malicious activity. The presence of external links indicates an attempt to redirect the user to potentially harmful content.

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://gimoguvi.ru/award?keyword=file+to+pdf+merger PDF link annotation
    • http://gijutudubesakuz.iblogger.org/14940775272.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/n50cjdG/papers_please_ps4_store.pdfIn PDF document text
    • http://rikaxepe.iblogger.org/alnap_humanitarian_evaluation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/skMiggg/20976339612.pdfIn PDF document text
    • http://wofeboz.66ghz.com/94608876564.pdfIn PDF document text
    • http://ralenexixozuk.iblogger.org/bachiko_nannali_full_song.pdfIn PDF document text
    • http://vofokifuzujusi.iblogger.org/business_writing_scenarios.pdfIn PDF document text
    • http://dronextactical.xyz/zasoxebobilagubiraxefalhw3xf.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/giyI6iZ/mario_kart_tour_multiplayer_not_working.pdfIn PDF document text
    • http://redita.fun/son_ng_vn_9_truyn_kiu_nguyn_duccr40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedaziwubisod.rf.gd/22047150811.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/balimidetuterebozakeb.pdfIn PDF document text
    • http://pukunoganisopa.epizy.com/fortune_telling_using_playing_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/30211530216.pdfIn PDF document text
    • http://goxakimolo.epizy.com/latest_bollywood_mp4_movies_free_2018.pdfIn PDF document text
    • http://peguretunemidom.rf.gd/baylor_university_campus_map.pdfIn PDF document text
    • http://xedoruvuseju.rf.gd/avatar_musik_indonesia_apk_obb.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/fegejibedelafovunumeve.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/microsoft_access_tutorial_powerpoint.pdfIn PDF document text
    • http://bikumekomem.epizy.com/nabedosukulut.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_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 4928 bytes
SHA-256: 7fd2ad9fb38b94d2a37ae3cd1b7b2f0ad925f265e4bc2bde69472adfc3aa56c9
font_01_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 12892 bytes
SHA-256: 1020bd5abfc7e01ad0476b993d9cbb857bb1a40f73908b9c5f152b3b63119dd5

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