Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc8659492b4d7eb…

MALICIOUS

PDF

74.9 KB Created: 2021-03-01 17:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a2544506a31ddde2109e7d7fbfe30c87 SHA-1: bfe4d3cb24a3130fa781ad4c9bf522f972a43210 SHA-256: 7dc8659492b4d7eb1f0d8df7811ecfa3e014d6973bda6ccbe2f5f95d91810bac
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://dafemum.ru/strik?utm_term=best+movie+maker+app+for+windows+10+free PDF link annotation
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/gitoravazak.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/3673606.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/59420792889.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/23117760201.pdfIn PDF document text
    • https://vuvoxuwamulixa.weebly.com/uploads/1/3/0/7/130739220/1022639.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/how_to_reset_cobra_car_alarm.pdfIn PDF document text
    • https://xibomuwupipufa.weebly.com/uploads/1/3/5/3/135389044/5dd46f6c82a9.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/1c661bb.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/77494561317.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/tulovapixo.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/fulezobifos.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/gusopi.pdfIn PDF document text
    • https://letunaxure.weebly.com/uploads/1/3/1/3/131383761/puxorobonofekife.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/how_to_say_goodbye_before_you_die_quotes.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/legewewono.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazatuv/71925073419.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/how_to_cook_rice_in_the_electric_pressure_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/photography_books_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/gatizuxabadaxoximunugew.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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 5616 bytes
SHA-256: 66dea114f1436f9cdf7bd692e5283516c93ae098608bb97bac7e681ad3a814a1
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10576 bytes
SHA-256: 911261ef272c5ca124119e44b8ae5a512829916a1109c3a8efe04e92dbff4257

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