Malicious PDF — malware analysis report

Static analysis result for SHA-256 0891a8c10eac93a5…

MALICIOUS

PDF

72.3 KB Created: 2021-03-13 16:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5f50246579895fad2620ecf56afd8101 SHA-1: a3dbded91082627bbf98cd99971115539520935e SHA-256: 0891a8c10eac93a5d9870f5cd87009e8fbd915ce64ec1c3b22387daf0099fa5f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Massey ferguson 1655 parts manual', indicating a potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=massey%20ferguson%201655%20parts%20manual PDF link annotation
    • http://m-ryanaf.site/king_lear_act_1_scene_4_quotes7rvcu.pdfIn PDF document text
    • http://gufutaca6.xyz/wumevijogafufesajvmeu.pdfIn PDF document text
    • http://freedate18.xyz/dr_jekyll_and_mr_hyde_movie_1931_blu_rayf3lea.pdfIn PDF document text
    • http://mikrotikwizard.com/pekigezimafobafaxur1c9j.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/11357100439.pdfIn PDF document text
    • http://cardioactiveitalia.site/shield_logo_ai_template5u5km.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/international_journal_of_research_in_pharmaceutical_sciences_abbreviation.pdfIn PDF document text
    • http://kupivse.xyz/game_azur_lane_pcvlnc2.pdfIn PDF document text
    • http://salet.store/vamo_alla_flamenco7gl2k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixopiv.onlinewebshop.net/how_to_use_the_bowflex_blaze.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/list_of_218_phrasal_verbs_translated_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c98ed09-b01f-4724-8708-d8ab7a8df555/dark_souls_2_dlc_release_order.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/how_to_type_power_symbol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b86195-b41c-436d-834d-9ebf4699a6a3/bofufax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70dcc7f-3251-4b67-8c19-b086ce080433/99416912737.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/human_anatomy_atlas_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7079e1-dd13-45d6-bfec-7f3d2d834568/cuanto_equivale_100_gr_de_mantequilla_en_tazas.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/rufupuveputofuresaso.pdfIn 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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 5660 bytes
SHA-256: 5b99f78aab3b48ff944a3fb862cc2feba542ae630380c442e8faf5417a85d6eb
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10956 bytes
SHA-256: 212e377920176777a538afec5278b67cc9a4339771c5dc3006fd242ca378050d

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