Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9cb0666df5c266…

MALICIOUS

PDF

87.3 KB Created: 2021-03-09 19:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d9842fdae9e45357a3ea8f5e6e716f SHA-1: ed878f04687a5492369386da39519b8be7af90be SHA-256: af9cb0666df5c266a67b091e2c3d2e03bd1ca105a7a57f30d746c3c85004f992
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable hosting and using UTM parameters, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=django+forms+charfield+default
    • https://cdn.sqhk.co/leloxoreje/jiiiije/24922792967.pdf
    • http://vashe-zdorovie.xyz/do_dachshunds_have_good_visionp1azc.pdf
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/1612291.pdf
    • https://muzuwetabez.weebly.com/uploads/1/3/1/4/131483468/xibomijapewupixaru.pdf
    • http://bukuketefiwuji.iblogger.org/how_to_solve_simple_and_compound_interest_problems.pdf
    • https://static.s123-cdn-static.com/uploads/4367019/normal_5febf7d851737.pdf
    • https://cdn-cms.f-static.net/uploads/4367005/normal_603b01212d6f5.pdf
    • https://cdn.sqhk.co/nexetifosam/dShdgdR/carrom_board_game_download_for_android_mobile.pdf
    • http://idealsit.space/encyclopedia_of_exercise_anatomy_downloaduoq23.pdf
    • http://lastmarkt.ru/kavedoguzoluoodba.pdf
    • http://1xbet-registrat.site/que_significa_elaborar_un_proyecto_de_investigacion_tecnolgicoogs2t.pdf
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/zararowopewexuguxatu.pdf
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/raferixajalo-tubijoxepa-nosolorexupit-muludilosi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viwoxuz/pujuxenixajejuv.pdf
    • http://bugudejekizukem.epizy.com/kerobobobolifexonadovi.pdf
    • https://s3.amazonaws.com/kotodur/diccionario_biblico_reina_valera_1960.pdf
    • http://mojokefav.epizy.com/22967204926.pdf
    • https://s3.amazonaws.com/firigugixujotov/setipuropenozevesiv.pdf
    • http://tupapepebaraj.rf.gd/2d_platform_game_design.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_off0001174f.bin
f46a23163ba2a79ce1e9b3cff4741560d062a0e9d79133c626508caa82f8bd63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 5508 bytes
font_01_sfnt_off000129ef.bin
ac9ad72989bc545cf61addbd6161731cbfed2f6850cbb5105806abceca2ea94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 11328 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.