Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ccd12c80a4a794…

MALICIOUS

PDF

90.5 KB Created: 2021-03-28 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 82c0d8559c14240b6319e65a4d3b7bc9 SHA-1: c5bfc7faa19664c19bbd81b2f275428c11942d69 SHA-256: 43ccd12c80a4a7949afbffdddd84697091493146459164e6531f0cc1418d8804
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external URLs, with one prominent URL suggesting a lure related to 'official backgammon rules'. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=official+backgammon+rules+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444123/normal_60220911011aa.pdfIn PDF document text
    • http://jotusuwes.iblogger.org/80313423219.pdfIn PDF document text
    • http://moreprodukti.com/663400673619q2fx.pdfIn PDF document text
    • http://vsspb.ru/world_conqueror_4_modern_war_mod_apks4a73.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/jumpstart_kindergarten_1994_puzzlessgdnp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497071/normal_6003b39f21cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_603c43fd0a2e1.pdfIn PDF document text
    • http://powerpoint4you.ru/apc_smart_ups_rt_1500_xl_battery_replacement8q768.pdfIn PDF document text
    • http://1xbet-football.fun/chinese_civilization_a_sourcebook_2nd_ed2198p.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/hp_officejet_pro_8600_compatible_with_windows_10.pdfIn PDF document text
    • http://fekijijiz.iblogger.org/how_many_calories_in_a_sesame_bagel.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/data_analysis_in_communication_research.pdfIn PDF document text
    • http://kinoxca.xyz/pagels_gnostic_gospelsdbhn1.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/rca_tablet_forgot_password_factory_reset.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/learn_english_speaking_conversation_vocabulary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepibali.rf.gd/80616352633.pdfIn PDF document text
    • http://tatesit.myartsonline.com/pokaxudidugadedosewosab.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_b39cfcc7a1a44da4be259b2424228048.pdf?index=trueIn PDF document text
    • http://rabopakuzu.epizy.com/13847990508.pdfIn PDF document text
    • http://jabulimoj.rf.gd/b_scan_ophthalmology.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_014789a2111d45a294f2249fe3b0549f.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_31086ff37b254d60b99727e281a06a1b.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_c755681fa8054c548caeeb94b57a5f7e.pdf?index=trueIn 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_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 5708 bytes
SHA-256: 58f02c1d78a73073dc2d49beaff3bea85e9425465a98c00335f738cb745f6bd9
font_01_sfnt_off0001362b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 10808 bytes
SHA-256: 2cda537ceeabe1668de0672fe58ba9e814b282d5d5122fa6af7f262c55201d1c

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