Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a20885c046e2769…

MALICIOUS

PDF

79.2 KB Created: 2021-02-27 01:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 60d7da9aa1158cccd3a57b3e7504e169 SHA-1: ddbad69c9c021b1f1967518250590f87dcaa5dde SHA-256: 2a20885c046e2769e3760ed287d4ecbcb5a1e97aa995cf1101a6091e0580ff1f
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://zajinet.ru/aws?utm_term=how+many+books+are+in+the+discovery+of+witchcraft PDF link annotation
    • http://mini-cam2.club/16573481632jbs9v.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/9aeb4ef8a8440a.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/bPhawhd/45087123724.pdfIn PDF document text
    • http://eglo.club/format_of_absorption_costing_income_statement7e4p6.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/befenewogopi_vetub.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/9eff24.pdfIn PDF document text
    • http://halfraire.xyz/commodatum_contract_templateqy9ug.pdfIn PDF document text
    • http://mini-cam-v2.club/1012737620366qvj.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/6005893.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/40370195098ph1px.pdfIn PDF document text
    • https://dejatenuti.weebly.com/uploads/1/3/5/3/135348415/3195586.pdfIn PDF document text
    • https://lenukanaferu.weebly.com/uploads/1/3/0/8/130873899/gimapujupurufe-rozudesipu-sozanob-namimamebudu.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/7004906.pdfIn PDF document text
    • http://milanbeachs.space/fetemukilk7pp5.pdfIn PDF document text
    • https://seronenufides.weebly.com/uploads/1/3/1/4/131407086/mukaviveni_perosez.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/meludav/fotulawefime.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/whole_wheat_pita_bread_nutritional_information.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_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 5648 bytes
SHA-256: 4463b465d1db2a687883b1565117481255e674f066328d97fdddd81740a7d070
font_01_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 9888 bytes
SHA-256: 3a985fe14db7693b1b355c169b3baedb0d57988f753d30cc9f8f8c23c367a638

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