Malicious PDF — malware analysis report

Static analysis result for SHA-256 341b4eb0043fff3f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 22:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1541503062b721d18cc5a74f826e072d SHA-1: b29fbb57ab3fc1b6884c05025a88799bd794aecc SHA-256: 341b4eb0043fff3f4c711630ba7a04bc41e0efd0576484e44d51480085997d28
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=free+abstract+reasoning+tests+with+answers+pdf PDF link annotation
    • http://playmarket-online.com/rikofilakoliyvyic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_603cb14317a9a.pdfIn PDF document text
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/1162799.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/naluporifexokugokav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_60293573ae81f.pdfIn PDF document text
    • http://eu-study.ru/hello_neighbor_act_3_magnet_roomqmbet.pdfIn PDF document text
    • https://fujikoxeloto.weebly.com/uploads/1/3/5/3/135307408/252924.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/jejatefowopinit-wuludip-jewugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_6044d5dad021e.pdfIn PDF document text
    • http://ru-en.xyz/rukijivumizuxigovuviro5iaod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_6032f1fb0ffdc.pdfIn PDF document text
    • http://kismyketio.com/pojunemovodepax71ual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_c7282e7217f6408ba81fbbeaf5150e69.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_e7a969bc66454750a980795357efb75d.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_87702046f8254b35b3b2bcb751e25e9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da28c56-a157-4c90-bac4-293cd445cafc/database_management_system_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff3230f-6f57-4242-ac54-eca4c0c5dfa7/conceptos_generales_de_investigacion_de_operaciones.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_fa42fec5e6714b29a2785d0fbc4d1d7a.pdf?index=trueIn 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_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 5572 bytes
SHA-256: 51714d88157013e4b23ca16123f1f2dbd5820f29e23085c657ce14c0c34172ff
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 11148 bytes
SHA-256: 098a85f04b70255cc2997ccc549bae0d7c8935243ea474e60b2bc1ef71268957

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