Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fa42a1017929ba…

MALICIOUS

PDF

186.6 KB Created: 2021-04-06 18:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2b3fa0755d33a2d0cef10a224eb07d98 SHA-1: 2134f81f136fa18238825811ac8e08a69955cd79 SHA-256: 73fa42a1017929baa89544fdcc4a55c79223d1d20ec2e65edb5ded4eb80ce033
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/award?keyword=arguments+against+mosaic+authorship+of+the+pentateuch+pdf PDF link annotation
    • http://remontnatali.ru/43064259141prd7j.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/9y0idhe/children_s_emergency_contact_form_template.pdfIn PDF document text
    • http://grantmedica.ru/43768472606bl0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5ff4ed4ab7f6b.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/71174233248.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/workplace_safety_inspection_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/PkjhgGT/avengers_xbox_one_game_2019.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/hoover_carpet_cleaner_solution_pet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_6066b2ff16858.pdfIn PDF document text
    • https://fakodide.weebly.com/uploads/1/3/0/8/130874451/a886525d5f04184.pdfIn PDF document text
    • https://cdn.sqhk.co/rodoruwuwab/VhhGgji/4696710214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_605c743b103f1.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/Vjihfe7/fufilorif.pdfIn PDF document text
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/bc21066.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/zexilejesove.pdfIn PDF document text
    • http://pasetbs.xyz/kofel06c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6029a19056bee.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/Bwiaijc/cheat_pokemon_emerald_gba_android_rare_candy.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/D5djggd/37987516818.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/wukowe-nozejabopu-voleva-kumugama.pdfIn PDF document text
    • https://jugevenow.weebly.com/uploads/1/3/4/7/134736768/jewumefof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00029b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B4F 5528 bytes
SHA-256: f07de9530b459ae049b2d38f366ac32328fc471ba59e42234c7bf1f129ba1e60
font_01_sfnt_off0002adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ADEF 14412 bytes
SHA-256: a017b1f04ef42fddedf7d01d94823e5dffe63b700fb54222b23114911b61aa8a

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