Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1377544d80ef7a…

MALICIOUS

PDF

87.5 KB Created: 2021-03-03 12:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2ce58dfa04abfba78e64348849fffbdf SHA-1: 81064c4c2228e09da79999e69ee19c706bc6a087 SHA-256: 0a1377544d80ef7a17b07496b097b2fd9da4fc0e8affa75e9a969f8e233ad1b4
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('vilenefex.ru') and containing 'utm_term=jump+trading+quantitative+researcher+interview' in its query string, suggesting a targeted lure. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The presence of these elements strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=jump+trading+quantitative+researcher+interview PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377379/normal_603f3f6adadd2.pdfIn PDF document text
    • http://znalomstvavip.site/61124973561zp9vy.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/the_joy_of_less_by_pico_iyer_summary.pdfIn PDF document text
    • http://vivadoctor.ru/misd_course_description_guideflv8f.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/GgcYiay/31565928571.pdfIn PDF document text
    • http://snatural.space/sazafoxn5au.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/825ijeY/kugexinewofos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupizamowakop.myartsonline.com/sony_cdp-ce375_belts.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/vovapodawapukixasaf.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/fofuzonezotam.pdfIn PDF document text
    • http://rugizasuvodaw.rf.gd/samsung_security_camera_sdr-b3300n.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_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 5724 bytes
SHA-256: 01c09e4bccccd9341fad8825ec949494cf0541a5cae6f2bc06dd1141eb940831
font_01_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 11636 bytes
SHA-256: 53a52f7e5021d2c869a3818d1f773419c70d498514f90215ea0b248d91f659a2

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