Malicious PDF — malware analysis report

Static analysis result for SHA-256 647d243a22eb056f…

MALICIOUS

PDF

77.9 KB Created: 2021-02-18 18:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7e711fbccda3da67c8697ec11d370d75 SHA-1: db962caa645ee417806b9852fb6adea9b1134b03 SHA-256: 647d243a22eb056f832e9d22077a65f87a244a470076c16c98525abcbc80fd21
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to reference 'postal operations manual 2020', a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=postal+operations+manual+2020 PDF link annotation
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/jabekasa-fezunev-majukobuzeferor.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/hfgg4gg/36603161696.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/jumugowalidazot.pdfIn PDF document text
    • http://gedagefi.22web.org/83602879753.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/ficHY8s/turbo_stars_game_download_for_pc.pdfIn PDF document text
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/5c08a0.pdfIn PDF document text
    • https://zimekepipo.weebly.com/uploads/1/3/5/3/135351260/6104276.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/2363621.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/3899779.pdfIn PDF document text
    • https://zoluwapipapak.weebly.com/uploads/1/3/5/3/135321816/1ef692ce0431b.pdfIn PDF document text
    • https://xuvasilibozin.weebly.com/uploads/1/3/5/3/135335949/3344668.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/tojiman.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/cde56f92c.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/Pjajghc/goal_goal_prediction_for_tomorrow_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/gcijijc/best_shot_3d_edm_music_game.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/1157611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veguvegonuz.rf.gd/nigebamero.pdfIn PDF document text
    • http://lagorov.rf.gd/kannada_movies_2017_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/arris_surfboard_sb6141_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/movies_2018_bollywood_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/67054583513.pdfIn PDF document text
    • http://gedamodeges.epizy.com/pandas_cheat_sheet_jupyter_notebook.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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 5240 bytes
SHA-256: 241e2f4434e23f897eb68ad94cc47d22e9706d98b7506bb5a4842663ce2cf7e5
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10248 bytes
SHA-256: fc8a6e6ce0f651307c2a6f49ec8ad8b553c0afc7b6461b8bf637bbf659e855f3

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