Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9820c6a136d978…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 21:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 826ab7c2fe07d2c9be0c7cf195599314 SHA-1: 1a2c724f3954db73383aecb0095d947a7180c7c8 SHA-256: 8c9820c6a136d978dba3ecdb85baf31851d2d8e54757a795d075d71a22afbc55
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('bologen.ru' and '3gusevshop.space'). The document body, though heavily obfuscated, suggests a lure related to 'Blackjack strategy chart', which is likely a pretext to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/award?keyword=blackjack+strategy+chart+6+decks+pdf
    • http://3gusevshop.space/predicate_adjective_worksheet_5th_grade8s0gu.pdf
    • https://cdn.sqhk.co/pememobuwir/NjfZS6h/super_dancer_3_finale_timing.pdf
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6036af37d788d.pdf
    • http://xonitaj.mywebcommunity.org/kuvogamotulilad.pdf
    • http://viwigevofuwova.iblogger.org/give_the_definition_of_corporate_social_responsibility.pdf
    • http://opsnatur.fun/happy_hop_kawaii_jump_mod_apkty2e8.pdf
    • http://4338bacchus.com/how_to_charge_a_g_shock_solar_watchiuonf.pdf
    • http://wekorarinorifen.iblogger.org/32601180340.pdf
    • https://cdn.sqhk.co/baruduwege/hepwuhj/subterfuge_meaning_in_urdu_language.pdf
    • https://static.s123-cdn-static.com/uploads/4483359/normal_6004900e7d5d4.pdf
    • http://webcam-model.online/79763634909xqlvo.pdf
    • http://jigikujed.scienceontheweb.net/28942686403.pdf
    • https://cdn.sqhk.co/tinupolureg/S1qgehb/19793284323.pdf
    • https://cdn.sqhk.co/fexiseme/ghBMwjd/filawudujarurikusoliletat.pdf
    • http://minesaxofunawi.getenjoyment.net/8350114197.pdf
    • https://cdn-cms.f-static.net/uploads/4485573/normal_6054fe340726d.pdf
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5fdb53efc0e96.pdf
    • https://cdn.sqhk.co/zarejesorufo/iifhjWo/sculpt_3d_model_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc75580f-21ae-4f5c-a4c6-29f26a298313/nobozijogojefevolofu.pdf
    • https://uploads.strikinglycdn.com/files/74b27f63-106c-4d4c-98f8-1cab113e0187/what_does_facilitator_mean_in_gta_5.pdf
    • http://sexupoweduf.epizy.com/define_immersed_transformer.pdf
    • http://zusujijotajirun.epizy.com/fopukonegewiget.pdf
    • https://uploads.strikinglycdn.com/files/76ce93aa-cb8f-4ae1-8bcf-b1dae3464710/english_composition_2_online.pdf
    • http://fuvogixerad.epizy.com/85146791606.pdf
    • https://uploads.strikinglycdn.com/files/467913ea-d053-4f90-9ee5-43532a189739/fupaxugawuxuvarasewef.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_off0000e94a.bin
b4736c3808b1ab87ae0e0532e8a9acb64e73fa4892b2182dab098cee88e932e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 5864 bytes
font_01_sfnt_off0000fd4a.bin
37070da415b650a0ca4fb35e349238a2ac959b106c061bf04060e5ffc91c2e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 11048 bytes

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