Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3333bceff20bcde…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 23:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dfedd9b042fabfa855c36b48ffb5bb27 SHA-1: 6936f37f2a8041316a7f87577f470b9f47077583 SHA-256: f3333bceff20bcde67d0aeaee1cf73ad5be383a1df22330f5a5654fdbb126757
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', indicating it was likely generated programmatically to obscure its malicious intent. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/aws?utm_term=quimica+organica+e+inorganica+semejanzas+y+diferencias PDF link annotation
    • https://cdn.sqhk.co/vitelodikef/jE7jcmI/zotezoral.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/xDkjg8D/crossword_puzzle_maker_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_601fa884b31fa.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/CEhd9jc/bonokalidepibako.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/wexakudutabu.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/aflatoxin_in_rice.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/hiPgghi/order_chaos_duels_ios_11.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/24611207340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493905/normal_5ff40a85b7bfd.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/kwjgia3/bendy_coloring_pic.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/factoring_polynomials_worksheet_a_1.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/hf43fwn/16219046100.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/dugalatimenezur.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/27262410005.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/canal_boat_magazine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5fc69426558ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_600e3e81d0ae7.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/27622878272.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/96548857082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furipurisebete.onlinewebshop.net/afghanistan_map_provinces_and_districts.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/catalogo_vimar_plana.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/john_deere_9500_combine_settings.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/44914942298.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_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5596 bytes
SHA-256: 00bf7e7a1d6735b0f76d48b01ec3428507e3adbb911be7cdc1fe5d7cca4161af
font_01_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 11512 bytes
SHA-256: a74f58ee22d0047fe221bf90d3f51bade6e70c271cbc8cdb2f9441cded8f2953