Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab9351d29f33940…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 10:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef0df571e2fd906d10ed8593262db575 SHA-1: 774ee5d7dc2ccd05ceb63e3852e49c300850c77d SHA-256: 3ab9351d29f3394075740ce38a52d82a76509480f630f1c08da0d3c031e2f645
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or scam campaign. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/award?keyword=anginas+de+pecho+pdf
    • https://cdn.sqhk.co/givifevulo/ie4CgKG/alto_s_adventure_wingsuit_how_to_use.pdf
    • http://alkostore.xyz/47394740667mx02l.pdf
    • http://sosuziba.mypressonline.com/donifarelasodot.pdf
    • http://komaxinatobofe.medianewsonline.com/how_do_i_setup_my_hp_printer_to_print_wirelessly.pdf
    • https://cdn.sqhk.co/nilesatu/jWgcBtj/bepubololekelivufolilesam.pdf
    • http://xubanapirobula.mypressonline.com/which_city_is_less_cold_in_canada.pdf
    • https://cdn.sqhk.co/nudogada/ccchche/4587600923.pdf
    • http://genusadnlo.space/banopizararfv35v.pdf
    • https://cdn-cms.f-static.net/uploads/4379618/normal_602b07956039a.pdf
    • https://static.s123-cdn-static.com/uploads/4413120/normal_5ff1c3827aaf4.pdf
    • https://cdn-cms.f-static.net/uploads/4469847/normal_603e1a6048901.pdf
    • https://cdn-cms.f-static.net/uploads/4380210/normal_6030266b18eb7.pdf
    • http://livemavuxedu.getenjoyment.net/dd_wrt_router_login.pdf
    • https://cdn-cms.f-static.net/uploads/4499285/normal_604195918e13e.pdf
    • http://vomamafawib.scienceontheweb.net/jordan_belfort_straight_line_method.pdf
    • http://doorstepcomputers.com/mibanusozarafojewomebras7.pdf
    • http://tiktokcopyrighthelpteam.com/winged_sun_diskinv4y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_85e7ceab3d3a4ebcb3d7833dc71e09b1.pdf?index=true
    • http://tofujuwo.onlinewebshop.net/fijegivinekadilarajowugos.pdf
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_7853b16f3a784f59b8c817b05f63a8d7.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_397a0985bd744f81991b602f92c902e4.pdf?index=true
    • 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_off0000ee09.bin
cee123938ab6b002d4a7a8e17fc1294e6773f3e02c8fceb053c0c2a4733532f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 5280 bytes
font_01_sfnt_off00010008.bin
7d6b9ea8f738dd9d1c5e3364b68c8493dd0486db448d7444415b89897d2f86e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 10972 bytes

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