Malicious PDF — malware analysis report

Static analysis result for SHA-256 727aa397fc0bfe78…

MALICIOUS

PDF

80.1 KB Created: 2021-06-14 04:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 398ae9c244e0de6d1d24b49cb8252850 SHA-1: 0c38977be54b404de284ebb5a9d6d5f0988f85c5 SHA-256: 727aa397fc0bfe78a9ea4ba21b5e823c1747de60f7bbe8b9afa199e37c576fe6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/pbw?utm_term=website+project+brief+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457590/normal_601359787a086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491705/normal_6067f2da1ce79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_60532a6eed202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5fc57ccb6c25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_60ba85b6c250a.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://uploads.strikinglycdn.com/files/538e5a2f-13f7-412e-87bd-29f1a03f5a0d/what_does_it_mean_when_your_car_says_service_airbag_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f004e50-7c24-4204-8cb2-bc79a82d49c7/63211599748.pdfIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144890949/nadosenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60522d7-58fe-42b9-a071-b17448fb495f/how_to_replace_battery_in_apc_ups_550.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/w/file/fetch/144642285/can_you_play_minecraft_java_edition_on_a_chromebook.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/adobe_after_effect_2019_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b71bf47-aa6d-4f20-853e-ecd8bbf743c0/krispy_kreme_chocolate_glazed_donut_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea45e297-697c-4a4b-9520-9d2f8e8a1ae7/nirezuwukojipepasawuru.pdfIn PDF document text
    • http://fenetikuro.pbworks.com/w/file/fetch/145030413/plants_vs_zombies_heroes_mod_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a36e205-a937-48df-a854-4dbecdb59d21/starting_strength_over_40.pdfIn PDF document text
    • http://radejaki.pbworks.com/w/file/fetch/145173198/urban_tale_full_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f85e87-448f-42ac-a6bd-5379fef2930b/sisatutexodomogadigegajod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24f2997-413f-4dab-9906-3f4b456206d8/why_does_my_verizon_jetpack_say_no_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb3189f-cdc6-48d0-a023-e2f81dcfc90d/na_step_working_guide_step_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4e8e8e-aede-47fc-94be-890843d9ba12/12988433893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab9bbb4-925a-43f4-8527-e53a931b687a/78625222675.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/50989855438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39467998-9453-4b3c-9665-220aa1909980/ximokenobubalivixu.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/w/file/fetch/144806811/kugigatiliruniriwaxokepub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a4649f-e99c-4f27-81b9-083bd0b1e341/45121606260.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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 5140 bytes
SHA-256: d6af078e66ddd508bd5de1b5fa93f31709cf860d8820643bab01456ad69b0a6f
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10468 bytes
SHA-256: 94f311ebcee8699863c6420765d5d0940cba42b35bf201eaa1055872397d4cc1
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361