Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cefcd5c96f2fb6…

MALICIOUS

PDF

85.5 KB Created: 2021-03-03 02:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e2e13466ffd8315e75fa28b0ba041b84 SHA-1: ca87ce435e6955992a49a5f59302017d28a726df SHA-256: 33cefcd5c96f2fb6ae85dd6b378185a427a40774cccd64641c95a3a8954cedab
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=designing+brand+identity+by+alina+wheeler+pdf PDF link annotation
    • http://tells.fun/analytical_methods_in_vibrationsu4mta.pdfIn PDF document text
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/mufejepamijipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_603c32a0c0389.pdfIn PDF document text
    • http://tcerkovniekupola.space/go_tell_it_on_the_mountain_song_writer4w8jl.pdfIn PDF document text
    • http://austritkfa.com/3533481279q7gfy.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/ghihi20/raxugiki.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/hiuTii6/nefejulebiruseluta.pdfIn PDF document text
    • http://ourfutures.space/pukapaxunutofznz3.pdfIn PDF document text
    • http://forpost-electrica.ru/tree_of_life_movie_reviewz0eht.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5ffc963b21aff.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/4a173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_603700ab0b739.pdfIn PDF document text
    • http://organicsss.space/gubojobisapuvokubazappo3f1.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/RPQjaYb/60659805032.pdfIn PDF document text
    • http://all-gopro.com/amplificateur_oprationnel_cours6ho03.pdfIn PDF document text
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/18b3cf386a72d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 5636 bytes
SHA-256: d9e4eaad65d49460fa373fd7c41e031e84c001aaea9f183714d26f0fcad67c0c
font_01_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 10784 bytes
SHA-256: 4ee746a08ceecc88e3febee50d3b8a302d5dfead2cb7424638a7393823a41833

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