Malicious PDF — malware analysis report

Static analysis result for SHA-256 f676364be362a7dd…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 13:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b98565c29bfa177416a3dc49b010851 SHA-1: e8952166972f9e5f86663b556a81f5804e785b6f SHA-256: f676364be362a7dd38f5db2f97e6fcc1bb1bd9f74eb8ff29e51c77c4c2ad58dc
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to a movie title, aiming to trick users into clicking on the malicious links.

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://pelibifir.ru/123?utm_term=martyrs+movie++in+tamil
    • http://ighelperscenter.com/512278827629eazk.pdf
    • http://tujukesabegakom.mygamesonline.org/xisoxawekologupenitafolu.pdf
    • http://remont-kvartir-otzyvy.moscow/777783810437046w.pdf
    • http://bosupena.iblogger.org/konuroxanodelipubatese.pdf
    • http://pearhaidhr.fun/carrier_weathermaker_8000_blower_motor_replacementmr4yi.pdf
    • http://fabifux.22web.org/nivuxoxagadunujasazugo.pdf
    • http://italy50wow.pro/what_is_prophecy_foreshadowinghfac6.pdf
    • http://zovunegem.22web.org/wuvorosezudema.pdf
    • http://giocodigital.fun/kekadenekogamicz8op.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zejawira.rf.gd/analise_livro_memorias_postumas_brs_cubas.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_f327289a171c408a9abde01fb1fab0a4.pdf?index=true
    • http://xijaxatob.epizy.com/is_white_fang_a_true_story.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_fe904a257efc40ecbddf3045b7a6adee.pdf?index=true
    • http://vesedakowata.onlinewebshop.net/what_was_the_punishment_for_theft_in_medieval_times.pdf
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_67dfa3a120f442d88629487ba5d7c87e.pdf?index=true
    • http://tibuwol.rf.gd/63900107980.pdf
    • http://batapijas.myartsonline.com/sojonanexezorigivurigu.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_2c9984d3c7f14427a51260125c651ce2.pdf?index=true
    • http://vasakuzepilaxi.onlinewebshop.net/33115435189.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_off0000f2c7.bin
ca3b631c526c62947b458d619e8013ee91d03613bdb0d70206b3022b9dfbf77a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 4996 bytes
font_01_sfnt_off000103c3.bin
79f38fe655fa3d9e4a911cbed30850b7504ba3d8bdb1e8bdbc2bcdb30959e23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 12240 bytes

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