Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0a9128c7438066…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 20:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44cf614020f5f47ce7649bb760820606 SHA-1: 2882cbdeecac9179cd2244e0f92a1fb402083050 SHA-256: aa0a9128c74380667e2eb4555eadb2b804d5f361aeeeb96720194ec8d5584fcd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://resalured.ru/award?keyword=biodiversit%25C3%25A9+g%25C3%25A9n%25C3%25A9tique+pdf
    • http://bcpzonasegur4viabcp.com/wotonubirakfpcc.pdf
    • http://com-signto5.xyz/an_account_of_an_experience_with_discriminationrqqwz.pdf
    • http://rozel.ru/a_world_of_ideas_jacobustzwly.pdf
    • http://gamukanemafutu.mywebcommunity.org/craig_portable_speaker_instructions.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/752de0b6.pdf
    • https://cdn.sqhk.co/jirudumom/gdgh702/11900946734.pdf
    • https://cdn-cms.f-static.net/uploads/4420934/normal_60552d458d272.pdf
    • https://metidelesaweso.weebly.com/uploads/1/3/0/8/130813592/72f93a8a.pdf
    • https://cdn-cms.f-static.net/uploads/4459059/normal_60255b2f6c2cb.pdf
    • https://cdn-cms.f-static.net/uploads/4369153/normal_602ff9947a360.pdf
    • http://uscreditinquiry.info/93462081879bzvur.pdf
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/1245022.pdf
    • https://cdn.sqhk.co/pavoraxebute/heL8iar/ghost_rider_3_cast_name.pdf
    • http://just-gopro.com/what_is_a_tilt_head_kitchenaid_mixergz2ir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_8529d717349b4560a6ee6a0b7609d417.pdf?index=true
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_bfd9d40424194f81b84f618f25b0d94e.pdf?index=true
    • http://sipanokule.onlinewebshop.net/69036346132.pdf
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_bc7403eb29bb478fa91e328990394699.pdf?index=true
    • http://jisijuvod.myartsonline.com/ximijupuzezivogovo.pdf
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_edce76997b644172a919d6dcd38bafa0.pdf?index=true
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_827e9f43a7f2498d9d9ebe005165448e.pdf?index=true
    • http://lijowavatajo.myartsonline.com/logitech_harmony_300_driver_windows_7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f003.bin
381d80af8ddfeeaf00a0a1db9941057e85ede9788b34f9d0383e3cf6ff0cba5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 5344 bytes
font_01_sfnt_off00010200.bin
a92c234ffe37e12ae067256f96d6b4425645652852f31767ed53b2af91da0650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 12200 bytes

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