Malicious PDF — malware analysis report

Static analysis result for SHA-256 7946eaac78525c84…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 16:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3324eaada75dc33782f29b95549e8b51 SHA-1: 6dc85165629fd3cef527e3dba93e23d6949cfe7b SHA-256: 7946eaac78525c842258f6d2f4e3487178410e4a19550b02851c275d480f9942
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, indicating a phishing or trojan payload. It contains numerous embedded URLs, many hosted on disposable domains or link farms, designed to redirect users to potentially harmful content. The presence of external URIs and the ML classification strongly suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=vimanam+malayalam+movie+video+songs PDF link annotation
    • https://cdn.sqhk.co/lagidexetin/jcBhhg1/best_retro_space_shooter_games.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/5306575.pdfIn PDF document text
    • https://cdn.sqhk.co/jonimaze/ohjghgI/usa_dating_site_free_chat.pdfIn PDF document text
    • https://wuruderow.weebly.com/uploads/1/3/5/3/135389815/8666660.pdfIn PDF document text
    • https://tabivivefevevu.weebly.com/uploads/1/3/4/8/134889686/4143332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_604cb54a59f49.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/bdjafgc/jurassic_world_evolution_movie_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_6055276aa9f8e.pdfIn PDF document text
    • https://pagebuso.weebly.com/uploads/1/3/5/9/135972497/xogib.pdfIn PDF document text
    • http://fusavexupisedi.iblogger.org/kulidisozimipivoragemu.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/how_often_does_a_judge_agree_with_a_guardian_ad_litem.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/ihgjfm7/gafajedigomak.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/convert_adobe_reader_to_online_free.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/gatotiv.pdfIn PDF document text
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/poxezupimisux-lilanadafaxij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/school_id_card_templates_free.pdfIn PDF document text
    • http://wofeduvep.rf.gd/54490199208.pdfIn PDF document text
    • http://gerevukome.rf.gd/54133571151.pdfIn PDF document text
    • http://gugakalorezo.epizy.com/49636652556.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/berifuvowujesuz.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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5176 bytes
SHA-256: 851f4bed3aaa0bc80ae2c2f707dc95fa3dc4fef49eb6a10c306105ea1fb1704c
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 11140 bytes
SHA-256: 3413dd5e71a3fd1db915f1e955f99aae7987425ab6047b7b313ea83a145fb1b3

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