Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fdf8c53a1da385…

MALICIOUS

PDF

79.4 KB Created: 2021-03-31 06:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ff55290c1fcd2af0c2ffdb5c2c5bdd77 SHA-1: 195119a44035ae00d8bac7b3a41c8ba47f132e20 SHA-256: 34fdf8c53a1da38512caee3fb87b13151945508a6b0b0b0128aa9e8902af2da1
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a potential invoice lure. The embedded URLs suggest an attempt to redirect the user to external content, likely to download a second-stage payload. While no scripts were explicitly extracted, the PDF format can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=basic+accounting+terms+class+11+notes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407313/normal_5fec7eec18baa.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/yahchdO/likimebijuresepasi.pdfIn PDF document text
    • https://lopifonexebifi.weebly.com/uploads/1/3/5/9/135986218/9586095.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fdeba8996377.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/beauty_and_the_beast_notes_piano_free.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/58023568625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5fd7093f7ee90.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/wolepaxite.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/ihhgieR/avengers_wallpaper_4k_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/Cc6Sdgh/pusivubevizebodulevajuror.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/41747973550.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/hh3id7Q/radio_italia_live_palermo_2019_orario.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601a402a3732e.pdfIn PDF document text
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/78e8a2e6a559b8.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/17b0285d-b330-476a-ac35-01c3bb57a283/tupepamikipatogadaran.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/intermediate_accounting_ifrs_edition_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c993c64-67ff-412e-9871-bfc1920be665/does_arbys_roast_beef_have_carbs.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/what_tools_are_necessary_for_woodworking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b36e44-728b-418e-8b01-6b83f2f9da11/idylis_air_purifier_filters_type_a.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/21223182173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d2581b-2620-4610-aa24-472e6f536933/bafoporotar.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/bach_fugue_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6b4f9a-9879-4322-9a2d-8320017f0685/95213501457.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 5576 bytes
SHA-256: 52f39f304ebdb22385b761af1245aaf3e750380f8599a16dc73c0d3881872407
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10668 bytes
SHA-256: 2f80ebd2ccb1ccafc1b29efa610f1438034ccd738e51d19147077ff9bbe40aee