Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55f4df18acd4fc6…

MALICIOUS

PDF

109.5 KB Created: 2021-03-03 07:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b334838ad3ba061416012015f339d5f SHA-1: 59e78f3c8a1950c609b25a0cbb9d9378a7c0705a SHA-256: c55f4df18acd4fc6e8c6804465068eae0f0be7622ba675f5b35f35b332a48192
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://vilenefex.ru/strik?utm_term=magnus+chase+sword+of+summer+quotes PDF link annotation
    • http://reactivaperu-2020.com/annihilation_of_caste_book_in_tamilpevy1.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/jfPzjic/38363918516.pdfIn PDF document text
    • https://cdn.sqhk.co/fotutubujuf/aCMh6Mp/mumifal.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/ggeVwhi/barcode_scanner_iphone_not_working.pdfIn PDF document text
    • https://borirokuve.weebly.com/uploads/1/3/1/4/131437567/vokabomaso.pdfIn PDF document text
    • http://winoorama.site/3438448772b72ln.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/fgigcjb/49169173880.pdfIn PDF document text
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/48ab95.pdfIn PDF document text
    • https://cdn.sqhk.co/riwajamugem/gjjiijq/sifipi.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/5404227.pdfIn PDF document text
    • http://braco.ru/redavoresotusi034p1.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/ijilij9/gitilijogotodesasofedoxef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/conair_clipper_blade_adjustment.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/lojitukosusuze.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_off000171c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C8 5624 bytes
SHA-256: a0f5b6969f6f3b5c89318939f20973a7833d8fa451ece92834f27ea22a6c1750
font_01_sfnt_off000184d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D8 10620 bytes
SHA-256: 42a0633559b49831cc846300b362473f0c3fd8ff1d4d2c1ff0951b2ceb41e937

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