Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b84c7f6fef249ba…

MALICIOUS

PDF

78.4 KB Created: 2021-04-22 23:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4fad261cde41166190cc1d67eb32eada SHA-1: 57d6432391b3fb5c8508247d8b0ebbc53029630a SHA-256: 6b84c7f6fef249bae04e1b4528dc06d2b66e502a08d5c2a381ea0c89daef0d01
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, with one prominent link pointing to 'https://zajinet.ru/strik?utm_term=wen+3920+scroll+saw+blades', suggesting a phishing or malware distribution attempt. The PDF's structure and the presence of external links indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zajinet.ru/strik?utm_term=wen+3920+scroll+saw+blades PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377933/normal_60446882444d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_604d7ba8afcf3.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/90108921151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5fe3f47760c48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_600919431bb8b.pdfIn PDF document text
    • http://depusapo.mypressonline.com/8657447499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_6052fb3c199a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc152ad6-bea5-4d92-affb-d61426c943bc/why_does_my_nest_thermostat_keep_turning_off.pdfIn PDF document text
    • http://zerujafulo.rf.gd/40321135040.pdfIn PDF document text
    • http://fugexumelelada.rf.gd/fabefulofud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c98a9a-e289-451d-b40c-f1fc8e8f81b5/soxanizafifatetodoguku.pdfIn PDF document text
    • http://xabetalofel.epizy.com/37767949833.pdfIn PDF document text
    • http://tasoged.epizy.com/5538967643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55420e4c-265e-4f98-b2d4-58a9688b9ae2/52259603052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8bdcc9-da78-43bf-96fa-8437baf3196a/jekonuxodit.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/comptia_project_study_guide_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb1a41b-4743-4e0d-915e-6d5962b0d5e2/wimiloxojemujekatesikubag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a36cf2c-fee9-43c7-b2ad-9141784e6690/is_paintball_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534b272b-9408-486b-ae32-0ae3eab46575/54313612357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609096bd-79f6-446f-b02c-457adbe35500/98191383949.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/vezaxifulanogulanal.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/kambikuttan_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3eeb831-a4aa-44c6-b76b-cd27cfe859e1/barrons_ap_environmental_science.pdfIn PDF document text
    • http://molodetagako.epizy.com/zixoforimebirudije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ccae7a-eb0e-4bbc-9dda-cdee4acd07f1/gemelevobekofujapum.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/ba_flight_cancellation_compensation_online_form.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_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 5772 bytes
SHA-256: 984fd7dfc57b9df3c85e6f49e768692520c384faa8954d004c6573cfb4d9df09
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 10992 bytes
SHA-256: 38e869fc2b72557da35d760ff6cccfb0ec8dbc164c1d468a62623f7964a62c52