Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ff05362ec9684e…

MALICIOUS

PDF

66.4 KB Created: 2021-03-03 01:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ef9d0bc0b86752e03c9ee9ffaf368b25 SHA-1: c655d933394f8e40f5ae46cbc8eb3e5571049cec SHA-256: f4ff05362ec9684e9fa175693302bb629cc76e3350ce13a265ad106e8f1e01e3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/award?keyword=how+to+make+a+one+shot+d%2526d PDF link annotation
    • https://cdn.sqhk.co/gukugifixija/hexhivQ/fulopobut.pdfIn PDF document text
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/kuvetavupe.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/juwiju_fegejusuwipes_komiziponupusu.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/jjhhXAi/king_of_thieves_base_30_layout.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/excelsior_definition_greek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fe3a35d0ad3d.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jctnEw7/xeluvunutipulukune.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/hbxC05U/canon_camera_connect_download_for_mac.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/is_5x5_enough_to_build_muscle.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ujhhhic/kuzimemebovunetujibol.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/ZhhLxKc/socket_server_example_python.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/ghiib0C/rekowotudobavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_6012e167a2654.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/jibururedepo.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/sarebezosom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobebol.onlinewebshop.net/frigidaire_fghb2866pf9a_parts.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/pajidegaxetidemipewas.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/57480658667.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_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 5052 bytes
SHA-256: 246831ba485d40ae63fea9e04775210af2a9fbb1f6541062abdab7364ff3fa73
font_01_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 9984 bytes
SHA-256: de8e019a71c2375ba5a5332cf36ff7d992beabd899e0a576a6ff41213f53e957

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