Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe48b8e3a7a6a275…

MALICIOUS

PDF

69.0 KB Created: 2021-02-21 09:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b8f07f6b3819ca2646442e6219aa18a SHA-1: fb0d5bbaaa420b4699fce7edd1acddaba6ec06e9 SHA-256: fe48b8e3a7a6a275a88e6700337aaa1ad162cc6b076529066d458c5c0356c183
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=2012+cub+cadet+rzt+50+owners+manual PDF link annotation
    • https://cdn.sqhk.co/pajijolabalu/iis4idd/biturutixa.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/lifJihc/encyclopedia_set_for_sale_australia.pdfIn PDF document text
    • http://hrushch.space/77249071494u2k8p.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/7224629.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/gfjfge2/fulilewutefu.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/hgjBVii/vomobazobutuw.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/5519971.pdfIn PDF document text
    • http://vvinorama.fun/zujulefawigagafibaqboet.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/9636015.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/1475434.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/ejhjbie/driving_in_car_with_covid.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/wofigewitujowe_fewedozom_levozor.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/ikXOhg7/teacher_aide_responsibilities_professional_development.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopekexu.epizy.com/62911705332.pdfIn PDF document text
    • http://batefagut.epizy.com/xaxoj.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/49332598615.pdfIn PDF document text
    • http://zogutofarori.epizy.com/9522327505.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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 5720 bytes
SHA-256: c4e4d13907c2faf6aa0300c64ffcccdd000748461e9ed53ec5d45749fd8931e3
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 10400 bytes
SHA-256: da078b75c210d556fce70d1dca9824e29b97bbe985aac7e45eecf077f1f1bb40

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