Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06f0f32bd5ef135…

MALICIOUS

PDF

75.9 KB Created: 2021-02-28 15:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d20ae9da56fa3321272d4923d49c12 SHA-1: e3fbad8f2261a39df366d770dfd99e0b44938363 SHA-256: f06f0f32bd5ef13510f942669fb081353f600d0716c29f8bdb5636eb17931ca5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://xajibur.ru/123?utm_term=how+do+you+write+a+case+study+assignment+example
    • http://guwilos.iblogger.org/sijaji.pdf
    • http://sdfsdfsdf.shaketorch.com/benenerumev.pdf
    • http://tugezij.22web.org/4041895177.pdf
    • https://cdn-cms.f-static.net/uploads/4477173/normal_6018f570ebbc1.pdf
    • http://ketorebagibof.22web.org/mopufeziwogogixaf.pdf
    • https://cdn.sqhk.co/kogoruzojif/idjZwgf/xurababivoxoluvaboduduvav.pdf
    • https://cdn.sqhk.co/xexisini/gMjlNhx/kiki_s_delivery_service_book_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wovovaj.rf.gd/11581661093.pdf
    • https://s3.amazonaws.com/donarepemi/letter_from_birmingham_jail_audio.pdf
    • http://xekalorebopir.rf.gd/cafod_laudato_si_study_guide.pdf
    • https://s3.amazonaws.com/mejados/74777237521.pdf
    • http://jinoratizoja.epizy.com/manualidades_con_reciclaje_con_cartones_de_huevo.pdf
    • http://zepinurubav.epizy.com/pokemon_online_games_free_android.pdf
    • http://fipugidu.rf.gd/66691628152.pdf
    • https://s3.amazonaws.com/fedojigudaj/yamaha_motif_xf6_price_in_nigeria.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1a.bin
8268808255697050cfc0244a7d3b83d032cb9e64d12721db1118980acee91389
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 5616 bytes
font_01_sfnt_off00010041.bin
794e957bc6da16421d210601b61212851ed396128cc391df4c57cdace19f5ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 9992 bytes