Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f13445544cb27d…

MALICIOUS

PDF

84.6 KB Created: 2021-03-24 17:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 75045ccfabceaa027bd8b5b5599d34a7 SHA-1: 9e92e8d88290cfe18530091bda6a4b50bf878dbc SHA-256: 88f13445544cb27dba07361f939bdb2de1b13eb863c11d4fa176ffa04a632b05
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a URL that includes 'avast pro antivirus activation code', suggesting a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely involving redirection to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wix?keyword=avast+pro+antivirus+activation+code PDF link annotation
    • http://postel-na-zakaz.ru/sub_zero_642_door_gasket5bqf8.pdfIn PDF document text
    • http://kino-vezde.ru/87039716276x238u.pdfIn PDF document text
    • http://lozhobelir.space/cyberpunk_2077_get_delayed_again25ziz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5fd643ff01c6d.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/hp_envy_cartridge_not_compatible.pdfIn PDF document text
    • http://lugirepapirizo.scienceontheweb.net/arduino_programming_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_6013b91cad4e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fe9b09542f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_601dbc0750da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379487/normal_5fff2ab0027c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_603f6873d138e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_604741565404c.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/38354639860.pdfIn PDF document text
    • http://padlamadla.site/ikea_water_glasses_australiagqxus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fccb1e115cc7.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/23f7b1d8-3742-4966-b328-87eaee4e1714/63454192611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17d0224-ea21-4cf2-a11b-feae1c6e2215/wabuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a2720c-779c-43e1-b8e7-90f57fd417c7/lunubekozenegonuzavebinop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b9913a-00be-4f65-8326-c5cd934db529/tws_k2_earbuds_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebb5a3d-d381-499a-9bec-ffe475867955/it_essentials_chapter_8_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100a4805-7112-4cb1-9c9f-750fc3a3abc4/kedelavibefamiropugikirul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6dc619-5f7c-49e0-a1c5-a94853575185/tugafupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90ada7e-613c-4cb5-99a3-d7a8cff38c3b/super_mario_land_2_rom_gameboy_color.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/adobe_photoshop_cs5_crack_free_download_for_windows_10.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_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 4968 bytes
SHA-256: b21de0a7d09f07208e541175143515959e0580aa7ab0531512fdba0b324839bc
font_01_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 10800 bytes
SHA-256: 45aed906b86fd0ed434347db1df9c39c9022ce3d8a0d99ec9f421830367ac4cd
font_02_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361