Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e338b7ae290e570…

MALICIOUS

PDF

82.7 KB Created: 2021-04-03 01:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d45df0d294edfb9748d734ae0bb43846 SHA-1: 77f5197033a9af027968963c72cc537a263b6ec0 SHA-256: 9e338b7ae290e570f8bc245da8d9535557382989525e7b9b6856a8fa065107d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. The ML classifier and ClamAV detection further support its malicious nature, with the primary URLs identified as potential phishing or malicious redirection points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=real+book+bb+vol+3 PDF link annotation
    • http://rinujajija.getenjoyment.net/how_to_use_timer_on_timex_ironman_watch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fc826665b2b6.pdfIn PDF document text
    • http://kopatizukuxaluj.scienceontheweb.net/turebozitinuxegejutax.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/9393321712.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/ijjTyV8/real_drum_electronic_drum_set.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/sOQ6xje/11654439996.pdfIn PDF document text
    • https://jadipiruw.weebly.com/uploads/1/3/0/8/130814676/29d72d2077e7ae.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/dARlMif/suxovibixarak.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/c7f55394.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/segesidilivilimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6026926c8ab4c.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/hfoghjb/dipson_theater_mckinley_mall_buffalo_ny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_4e9fa29fbb594358bbb934a606003e93.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_476c78ce3fec4005b835661f5280bd67.pdf?index=trueIn PDF document text
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_0d882a7711e64d2884af220ec4ef1ad7.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_271f0e1cb9744c699a9845c614a9577d.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_d8d10c3e76794d149f9eb1c7bd24615e.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_0d2650b7438f43b1b72b88db14e95d47.pdf?index=trueIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_ed314737f8ad47468a5cd0e9e61c8197.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_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 4840 bytes
SHA-256: bfcce2c847befefe6d3a34ce9fec48f5ad0245e69321c0d70b0613db1efe3ecb
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 13024 bytes
SHA-256: 27c4015c233143643475bce4e5377d71199eb5ccf1c104ca3120ef3e1e05d2c6

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