Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dd35024b8f6b61…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 13:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ad168d1c65f8eead36a763514fa9505e SHA-1: db97bcd93bdb150cf33d22460c537f9ee29465e3 SHA-256: f1dd35024b8f6b6167cc2a870368542f3de6b1ad103c693f41766e6f267c71ae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://jacksth.ru/award?keyword=can+an+unmarked+police+car+give+you+a+speeding+ticket+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368731/normal_60255f1c463ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_600ecafca55c9.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/html_css_template_no_bootstrap.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/zulezurodifinu.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/how_to_set_time_on_timex_ironman_triathlon_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_600c9b19740b4.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/deh-x4700bt_no_sound.pdfIn PDF document text
    • http://likozibave.iblogger.org/57164888941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_601dd7c7f40aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fcaae72a7179.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/1868021268.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/brown_vs_board_of_education_effects_on_special_education.pdfIn PDF document text
    • http://duvodix.myartsonline.com/divuwanobak.pdfIn 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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 5524 bytes
SHA-256: 352fa1d0669807d9aeeb298c4d5d6f4c2fd0c630f0987fab9fe603f4b24c92f4
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 10660 bytes
SHA-256: eba1161662a8ab7c0eae8d82ee31a7ace35473886f90e9991c77b88569e2588c

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