Malicious PDF — malware analysis report

Static analysis result for SHA-256 831b4b39bf5c4706…

MALICIOUS

PDF

72.3 KB Created: 2021-03-20 20:38:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a7183b3a4dd0f59a4db3a8dbf468df89 SHA-1: 746a0b832293a89ac8e34d876b2cea4d37246fdc SHA-256: 831b4b39bf5c47062522493e5a622d3dbe2cfbc68357596f35daf4996ac9afcc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://vilenefex.ru/wix?keyword=craig+soundbar+cht940x+manual PDF link annotation
    • https://cdn.sqhk.co/xasexuwosul/axhejeu/94977381948.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/jabewebada_nifomefizumejak_xevobugimo_dojatipuvesira.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/4422120.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/thcjf2s/56576762349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486981/normal_60446483202b7.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/gjdnIia/pavovogibobagovipoz.pdfIn PDF document text
    • https://fobabugukejapa.weebly.com/uploads/1/3/4/5/134576868/jodegeduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_6049941bd19e1.pdfIn PDF document text
    • https://gasulemuj.weebly.com/uploads/1/3/4/3/134352818/kabekufinivut.pdfIn PDF document text
    • https://vavetupabon.weebly.com/uploads/1/3/3/9/133999816/kubujufipe-pejixe-fajanuwup-nejukewoto.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/eifichj/best_rechargeable_headlamp_with_red_light.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/cf7cb9fae36ad3.pdfIn PDF document text
    • https://kagepejipewabo.weebly.com/uploads/1/3/4/8/134871264/214923.pdfIn PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/kebotaxebamaketejoku.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/jiluludewedemibodegi.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/jjgjGER/free_offline_games_to_play_on_pc.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/8c636383-fdcd-473d-bb66-94bbf8819a29/the_course_of_love_alain_de_botton_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/biblia_de_estudio_matthew_henry_ampliada_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/64109702080.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/job_application_cover_letter_word_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c0c5de-c9bb-4c26-890b-e3ce7c3e6c28/rikalanawawutufutofudod.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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 5852 bytes
SHA-256: 4c6ac474d8bb110db1caa8215195d9683175289684c4718ff00647e2af095827
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 11244 bytes
SHA-256: 1e68ef22ce5bbbcb69cfe392c0457927858cfc77a6fe5726c0b47b418ade7965

Open this report in the interactive analyzer, or submit your own file for analysis.