Malicious PDF — malware analysis report

Static analysis result for SHA-256 d199f0a8e9e1d1c5…

MALICIOUS

PDF

84.8 KB Created: 2021-05-06 16:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a40386fe72d05e0473478fe8eb347ab SHA-1: b3acea2d3d0f032dead15a048593591eea8136ea SHA-256: d199f0a8e9e1d1c59af8c9ca0f904b44739031b61a81e4bf9b50182976f71dc0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of generating many external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=apc+back-ups+es+500+continuous+tone PDF link annotation
    • http://nawitebexu.medianewsonline.com/barrier_meaning.pdfIn PDF document text
    • http://futajef.medianewsonline.com/wavovorivumobidebajigo.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/phonological_processes_age_of_suppression_asha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_603235087b528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5fc8729e2354b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5ff0f45132222.pdfIn PDF document text
    • http://kozugufasuroti.mygamesonline.org/56958984505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_602c1dde5d8dc.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/factoring_quadratic_equation.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/d292e23a-08e2-45f1-b35c-03c8ebc6c7a7/sababadowoti.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_db84950b1180453a9530f229338d0003.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fedbbe4-3f3e-40f8-a4b8-99ae137761bf/how_to_make_a_cleric_5e.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_c09edbb33c3d48fb956c08f188035ba2.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_c94d8d6d993345d3adf9f566ab8406c1.pdf?index=trueIn PDF document text
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_ff7631038f3d43e69cbfea49ddfb2080.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed5292e-5e29-4781-8537-10e0ed460704/67511928076.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_ce2a6451c0d9495da47118e69da6694f.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_35aab824fff745ef8d1c2eecf6526d7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0175670f-b4e8-41f1-a466-a7be60c85fbe/how_to_use_apple_cider_vinegar_for_dog_mange.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_cc5fa377a60d4cf9b4befb871f37d9a1.pdf?index=trueIn PDF document text
    • http://zakexukosogu.atwebpages.com/adjective_clause_and_adverb_clause.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397300bb-0b1c-4a74-9cbd-392c256d960f/25752631246.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 5172 bytes
SHA-256: 5ad3408d2040ce7d786034ce5a8636ad666c6a3656104592d3f82bd09364a3e1
font_01_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 11728 bytes
SHA-256: 4789155af8d41a8249f15924921b70e73b25fcacb372b3990d77b8dd28464b7c
font_02_sfnt_off00013777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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