Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e8a90b328f3929…

MALICIOUS

PDF

97.3 KB Created: 2021-04-28 22:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fec40139561db028dc0d7ed994461eef SHA-1: 2b03b58034dd63b178beb3ebb8179b002698dc0b SHA-256: 99e8a90b328f3929b262ea0fb2d79eb39761323cc10ce867d807427f19ef1c39
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to 'True Detective season 1 episode 3 script', aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=true+detective+season+1+episode+3+script PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384483/normal_60357e6b009f6.pdfIn PDF document text
    • http://kufagexuwinu.22web.org/lopefapilodizaret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_600be7bbae45a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458631/normal_600480b179f18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5fcc90951ae68.pdfIn PDF document text
    • http://kisagek.22web.org/kufadekonibezaxejo.pdfIn PDF document text
    • http://8gusevshop.space/mastering_bitcoin_unlocking_digital_cryptocurrencies2th3q.pdfIn PDF document text
    • http://sobofikikovir.22web.org/manual_de_auditoria_ambiental_en_el_peru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_601997f00de14.pdfIn PDF document text
    • http://farvestnn.ru/french_learning_book_freea1ywc.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/modoredikikijerivf27t7.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/d09e52a5-5017-4f3e-87e7-982c66912dfd/27620542824.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/gopeduki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2bf99d-ec79-422e-945e-26cd580298db/kepuwufofagaruvaxotiz.pdfIn PDF document text
    • http://guwupurog.epizy.com/65806836499.pdfIn PDF document text
    • http://zebowupudilo.rf.gd/black_and_white_printer_test_page.pdfIn PDF document text
    • http://buwefewi.epizy.com/gopiseduniwafolibasovi.pdfIn PDF document text
    • http://tizaxagarokilop.epizy.com/smokehouse_little_chief_front_load_smoker_reviews.pdfIn PDF document text
    • http://wumurunapaxilar.rf.gd/79424903463.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/does_artemis_fowl_fall_in_love_with_holly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d85d8cf-00d2-480c-9f2e-10527f23a7ae/zidumikadinazajugifuparu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230a10d6-f518-44b2-b387-5694af48bce1/45294831031.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 5144 bytes
SHA-256: eb121e6433b81f24085073f0cc72992e39df474a43c0e5936fd8874fc3b00040
font_01_sfnt_off00014335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14335 11144 bytes
SHA-256: dfa05ebcbf70721494d06fe32962360f1e334a158923018c7157b4dfa5b63279
font_02_sfnt_off00016952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16952 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f