Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b70c285b42cbba…

MALICIOUS

PDF

87.6 KB Created: 2021-03-04 08:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 15b8e42703cdd4557b70492380e8ab92 SHA-1: 5b20ebb37da582921e166dde35a71a427966dad8 SHA-256: a9b70c285b42cbba0ce684a40d6c1a2338221e1ecd297a725dfae8833f41ce12
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to 'food recalls' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious 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://leonvi.ru/award?keyword=what+food+has+been+recalled PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366976/normal_6001a4884fb34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_603e3a822700c.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/32305263458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_603b6b3090367.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/fexidifi.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/ezjgKjj/mivotowogone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461509/normal_6007a4b64e22e.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/top_safety_rated_infant_car_seat_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5fe740c323cca.pdfIn PDF document text
    • http://tehnotop.space/wuvoresusalezapadoj88z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/propresenter_5_windows_10.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/the_boy_in_the_striped_pajamas_book_movie.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_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 5260 bytes
SHA-256: 4bd2853e51ec79d6dd386df29c5ec78f8a90b688076cbe87cc6eb242ea5fb92f
font_01_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 11928 bytes
SHA-256: 91fd97f4cd6627351f6a9f8de22e29a4124347eda18423b0d0b4eb9a94a2af23

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