Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecd31791e9d8c25…

MALICIOUS

PDF

88.8 KB Created: 2021-04-29 01:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eb7bb4f751711e0e3dfb0c8e453a11b0 SHA-1: 739c3a27006cad48a977aa45fff408a503510fa6 SHA-256: 2ecd31791e9d8c25987b72856eea1ab4eb5041b7e230282072ad9c562505c36e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one pointing to a suspicious domain ('seumenha.ru') that appears to be part of a link farm. The PDF structure and the presence of multiple external links suggest an attempt to redirect users to potentially harmful websites, likely for phishing 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://seumenha.ru/strik?utm_term=clarion+cx501+connect+bluetooth PDF link annotation
    • https://cdn.sqhk.co/semiwewedazi/giAiejh/coin_pusher_real_claw_machine_crane_game.pdfIn PDF document text
    • http://varistop.site/how_often_do_kelly_services_employees_get_paidfbdz6.pdfIn PDF document text
    • http://my-favshopc.online/king_lear_summary_act_4_scene_63zt7u.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/Ehhbjii/chex_quest_2_gzdoom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_6046fd4819ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_6034c62a6a905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_744c3b6257314436afd5b3c62b81287e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4baa7586-fac2-4cd0-8d86-c33e5b3a1e66/luduzanor.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/2694426701.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/93966236046.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_0b01972336a04d0a9fbdadd1fc72645e.pdf?index=trueIn PDF document text
    • https://e37fb4d6-fac4-4cb1-96d9-cce2dae532e5.filesusr.com/ugd/ed2751_b03ac8bac55d44e6a503df7386cb5bdc.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_666bfc8cc15a4dc7b5794879a88beb91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75a79bb-5e51-4c50-9e71-6e7c988d1de4/28151065009.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/the_hardened_heart_ffxiv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d36e14-eb58-43f2-a96a-4745288b23cb/summary_of_stopping_by_woods_on_a_snowy_evening_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/37764099234.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 5140 bytes
SHA-256: e6f76ac6ca32127fe883ccff18557ac6377e5e0abd608a218bf50d7ea8c0dbe9
font_01_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 12800 bytes
SHA-256: 29297cf313df3b9ebd32db233e11c69a8a8f0a5c0e9b78a0dee780d2c940ba64
font_02_sfnt_off0001480a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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