Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ca047a1bf0a47…

MALICIOUS

PDF

74.4 KB Created: 2021-03-02 22:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb91429c3a134af21bb114c4e4291f44 SHA-1: 7ac9d90456865d375f7bb09a6e072a5189044bc8 SHA-256: e33ca047a1bf0a4712cb2d76e47bcfdab01cad6d594b112e19db497ca7a117de
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous disposable domains and UTM parameters suggests a campaign to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=what+is+the+rarest+myer+briggs+personality
    • http://larts.digital/vaxenofunovatuxavikumexfnr9.pdf
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fe9f3e9e5c95.pdf
    • http://kipegujodup.getenjoyment.net/jblm_main_gate_visitor_center.pdf
    • http://raxejudesezix.scienceontheweb.net/xapepetobivuwerazu.pdf
    • http://gekifek.scienceontheweb.net/le_corbusier_five_points_of_architecture.pdf
    • http://pakunobun.getenjoyment.net/ktm_1290_owners_club.pdf
    • http://wogivodugakovek.mygamesonline.org/ragexujuponokado.pdf
    • http://hookup681.site/wd_my_cloud_ex4_custom_firmwaremqnsf.pdf
    • http://fanutoragozogow.sportsontheweb.net/garrett_ace_250_metal_detector.pdf
    • http://siwupojotuj.getenjoyment.net/the_americans_season_6_episode_3.pdf
    • http://lofajemami.sportsontheweb.net/30960406401.pdf
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5feb6ef403a4b.pdf
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6029a19d2c5a0.pdf
    • http://suzamajotibe.mywebcommunity.org/90540240235.pdf
    • http://amin-ukraine.net/67211996138uw8v3.pdf
    • https://cdn-cms.f-static.net/uploads/4494674/normal_602003f7bf847.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gutekuretejapoj.onlinewebshop.net/mumudowabebovesefe.pdf
    • http://nojikigor.myartsonline.com/history_of_indian_art_class_11_full_circle_download.pdf
    • http://perexuwofogefo.onlinewebshop.net/75940571460.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_off0000e5f2.bin
f425cc7dcc2f0f894e99d83b3776eb7367886c17808918e6e5f08c3c1a4fc899		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 5488 bytes
font_01_sfnt_off0000f886.bin
5efac04e6bdba2e0fb882e2433d5bea1b8b72477b3e1419af8b9999822fe972d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10504 bytes

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