Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6a391b9d7230ba…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 15:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d9c1fee23f9c69dfa76d3a38f2a8d6b2 SHA-1: 2257b652aa9c22a3db2b75099f91b6f57045f3dd SHA-256: ff6a391b9d7230bab6d5cae9e795e7dac14f02984c864879bc18e1cc86f934b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL being https://vilenefex.ru/strik. The document body, though heavily obfuscated, appears to be a lure related to a movie cast interview, likely intended to trick users into visiting the malicious link. No scripts were extracted, but the PDF structure and URL distribution suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=in+the+heart+of+the+sea+cast+interview PDF link annotation
    • https://cdn.sqhk.co/wubunepan/biem2hi/rock_out_loud_live.pdfIn PDF document text
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/8619743.pdfIn PDF document text
    • https://jerepuda.weebly.com/uploads/1/3/4/7/134745202/59b54.pdfIn PDF document text
    • https://gudozegibuxof.weebly.com/uploads/1/3/4/7/134732985/junonegexawaj.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/gebobipo_zovol_wusapoguv_dijesagesafuv.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/4e9cec7.pdfIn PDF document text
    • https://kudilasiwutoxe.weebly.com/uploads/1/3/5/3/135314551/2937754.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/gujuduti-xopile-xemiwem.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/f5a02b7.pdfIn PDF document text
    • http://wegutamozeji.iblogger.org/coleman_inflatable_hot_tub_pump_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/Chagghc/local_grass_cutters_near_me.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/2487588.pdfIn PDF document text
    • https://cdn.sqhk.co/divutugim/ejfgdCp/31698722776.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimadetuvawese.rf.gd/fizogufogedinogewerogija.pdfIn PDF document text
    • http://janofegiwene.epizy.com/blood_strike_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0baf968f-447e-4f47-a46c-48e1f29763ec/asp.net_mvc_tutorial_for_beginners_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5248514d-6e5d-49fa-9d06-4882f78ad7a7/xabipifazeti.pdfIn PDF document text
    • http://zufosigikirir.epizy.com/maxujixevaxikijazijed.pdfIn PDF document text
    • http://zivigujuvove.rf.gd/vawupufopaxovezux.pdfIn PDF document text
    • http://xubumanazi.rf.gd/dcs_world_f-15c_training.pdfIn PDF document text
    • http://xuxegukazo.rf.gd/readworks_arachne_the_weaver_answer_key.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 5028 bytes
SHA-256: 93b4d4c05f92b6c7631f2e24d444fe8c4d737185dd572fb5ca00679a51f4b218
font_01_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 10848 bytes
SHA-256: b42b052f70fe351ac16f9b5d8779bd1fce55b153822d0415eae05061fd3cb629

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