Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ea01eb27cfa7ba…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 10:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffbd2e06bed083095840961dc5719538 SHA-1: d6c0900fd05729523e2daa8df0b194551e7c575e SHA-256: a7ea01eb27cfa7baffca93413b5136a9535ddfa4f16df05718f870a9ce2e78cf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=brene+brown+books+amazon+uk
    • http://wuroguredogir.getenjoyment.net/34944340338.pdf
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fce1fd22a6b3.pdf
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd6452abe5b6.pdf
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5fc932ba5fe97.pdf
    • http://lilubaxubaxulu.sportsontheweb.net/brahmacharya_download.pdf
    • https://cdn.sqhk.co/vibisidumes/UFlgigg/defender_legends_new_era_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4446165/normal_60627556e016a.pdf
    • https://cdn-cms.f-static.net/uploads/4375361/normal_603846c4656f6.pdf
    • https://cdn.sqhk.co/zowonefaso/etib8ic/surifemu.pdf
    • https://cdn.sqhk.co/wozepefiga/jjMhahc/bricks_breaker_crazy_blast.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_ca4d35d57d4b44a783428a8afbdc0a18.pdf?index=true
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_abc4c0907ec4449aaca3024f585eee76.pdf?index=true
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_a5b9fc4222b646eca6a465631fe48ff2.pdf?index=true
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_3081e131e4094348ba3afe7650ef6750.pdf?index=true
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_c0dfb9d9da5e45e6aa52f636d5011fc6.pdf?index=true
    • https://45884d5c-3037-4093-99f9-9b9c28a1e9f0.filesusr.com/ugd/3721b1_ddc9f6ba55cf4cd78b9dfe4b3613495e.pdf?index=true
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_bfa2e3bf797b4e7595ee1a60dbff3e43.pdf?index=true
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_92b54a3866c74dbd932829517035afa0.pdf?index=true
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_1efd11ab104f46009955c3768b61f331.pdf?index=true
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_faae2d91e3474809beb8437125276d89.pdf?index=true
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_17a5eb274b5b4309823740a30bd3b781.pdf?index=true
    • 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_off0000fccc.bin
4b52891e7db8d007b3fd3f16b050545a1a816fe3b00282404518afc8e8b8b49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 5196 bytes
font_01_sfnt_off00010e7f.bin
c4162ee483f19120bbcd0f91a6a5cf452f31a214f474717516071b95151d6e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 11196 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.