Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68b38f00421eeda…

MALICIOUS

PDF

79.1 KB Created: 2021-04-11 21:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9f400f694b3cd05eded3c5597684abf2 SHA-1: da16cc4e8667e3ea5dd455ec06fe24072e9e8e48 SHA-256: c68b38f00421eeda9a5f6839f3bdda70b1b46a53314832e8260a93e944a8c04b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including suspicious domains like nipisod.ru and goods-amzon.com. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=who+owns+skyline+rv PDF link annotation
    • http://goods-amzon.com/dengeki_bunko_crossing_void_apk_englishzzg6p.pdfIn PDF document text
    • http://temezisabekazev.iblogger.org/cesare_pavese_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_606a295090f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_606160d2a1786.pdfIn PDF document text
    • http://delavivajew.22web.org/matuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481155/normal_600406d0e65ee.pdfIn PDF document text
    • http://usacreditreport.info/fofufoxgc8q.pdfIn PDF document text
    • http://martans.space/chemistry_balancing_chemical_equations_worksheet_2_answer_keybhuae.pdfIn PDF document text
    • https://gikemuzeta.weebly.com/uploads/1/3/4/4/134442652/sezowipogolugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_60674e3d76d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6014c2d728920.pdfIn PDF document text
    • http://hotloveme.online/skater_xl_xbox_one_mods9stgx.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/bitap.pdfIn PDF document text
    • http://vabaxowerad.iblogger.org/tiwumulijekenavutup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/facb5897-f256-4b1b-859e-53d24891feb3/43663444446.pdfIn PDF document text
    • http://ragakinetepufub.epizy.com/mozamiwokixalag.pdfIn PDF document text
    • http://sibepiz.epizy.com/house_of_leaves_book_cover.pdfIn PDF document text
    • http://murarefap.epizy.com/bmat_preparation_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1261c5-a1a1-4bca-9d87-38e82fb50c7e/how_many_miles_will_a_honda_shadow_last.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/cambridge_additional_mathematics_book.pdfIn PDF document text
    • http://jesegusanasukan.epizy.com/vutesusuzegiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 4896 bytes
SHA-256: 40a36b916948bf6961c5047f52a6e08eaf9ff7c2346a2b87447360564dadf557
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 12116 bytes
SHA-256: 4e21ceb2bd73bcc2005fb054bcad27277dd0fe6eb8e100060c98e00578c76a92

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