Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bc6258458b8c8c…

MALICIOUS

PDF

100.1 KB Created: 2021-03-01 16:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 27e01f82d01653eb1af9bba050b4d4d8 SHA-1: 66a1a92e5bc87dab0119004e50a8b991d57b6874 SHA-256: 21bc6258458b8c8cd28f63ceed157eb7533f51252327cecd9cc84060103b2b42
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though partially corrupted, contains text related to 'Toto washlet c200 price', suggesting a phishing lure. The embedded URL points to a suspicious domain, likely intended to host a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=toto+washlet+c200+price PDF link annotation
    • https://cdn.sqhk.co/gigatakel/zhaQj38/24298848280.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/83119289840.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/what_is_the_meaning_of_presentation_self.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/3034593.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/63375819234.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/what_is_base_rate_neglect_example.pdfIn PDF document text
    • https://zuretajobujab.weebly.com/uploads/1/3/1/4/131483148/84563b1b46.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/zutinekekoregikuwa.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/70957407662.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/hhJjeDd/28504271384.pdfIn PDF document text
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/lovakixitipipef-vonosumemotob-xurariju-puxasudimu.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/nawosineromigi/lepeji.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/unconformity_meaning_science.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/calendar_2020_template_cdr.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/28523435589.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_off00014a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A48 5336 bytes
SHA-256: 29789a1eccc5c5b0cc47e525ebbde4de44feda4ff3dfdebe64bcbf2dde2fb731
font_01_sfnt_off00015c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7B 10908 bytes
SHA-256: 1c7a571c57a9f3c311e60c081cc6476a1af3a63c8bc10a6914c0909dfff55c8b

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