Malicious PDF — malware analysis report

Static analysis result for SHA-256 df755e32935cb81f…

MALICIOUS

PDF

66.2 KB Created: 2021-09-26 15:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e5d8c4d1b7ed3f501dc0359ecdfcce4 SHA-1: b92bf2c79c556bb7efdd2ab966d50c9cdc1e24f6 SHA-256: df755e32935cb81f220cc85941399c7d546c31ddbbda93a17232a32dff44289f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://laborke.ru/uplcv?utm_term=can+a+smartphone+be+tracked+when+turned+off PDF link annotation
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/76831982296.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/dumozaxazenugeb.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b969b055c7d8def1260093eecd43552/numunekofulixeriduzedi.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/molokasorijozebusipi.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/pifotobewufulonujuvez.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/rudafikulibad.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/naruwomululusawanevisukuv.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/82974678599.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/xiketejifoza.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/32478551509.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/60821970937.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/wamusabepani.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wetirudipovuzigerubivur.pdfIn PDF document text
    • http://enricobarraco.com/files/kiwakepopu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4DA 14748 bytes
SHA-256: 971adfe82c7d90b6332d05ee95c053ca57df724570a8e2f3d61d2e88103cd6d9
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 11196 bytes
SHA-256: 4085354dcf2b70a2c6ec9b125161a4d961d25e3a841b0fcac6027d3a29589ffa
font_02_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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