Malicious PDF — malware analysis report

Static analysis result for SHA-256 497a816737f4db7d…

MALICIOUS

PDF

68.1 KB Created: 2021-03-09 08:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8b736776ebea62d1afa173349a61065d SHA-1: 5f0b2e3f43014d920cfffe5e5258d072a226526b SHA-256: 497a816737f4db7dddf578040b7658812ca0158f647d2ffc9741cda9be53980c
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Bhojpuri song dj remix mein' and 'wkhtmltopdf', suggesting a lure to disguise malicious links. The presence of multiple disposable hosting links and UTM parameters indicates a phishing or spam campaign aiming to redirect users to potentially harmful content.

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://ponafet.ru/123?utm_term=bhojpuri+song+dj+remix+mein PDF link annotation
    • http://tajasilikiw.22web.org/sorexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_6035483194df8.pdfIn PDF document text
    • http://sumazubaviloxog.22web.org/26474621080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6044947251614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fcc1c38b841b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_602810f993dd3.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/hianNJk/52962009863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_600d4e55ecd09.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gghjdsF/50355590195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_600645ad9ea08.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/4jegd5r/79741747733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxomipeb.epizy.com/pycharm_format_code_on_save.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba024488-b07e-44ec-9790-e0e6c62310f6/sears_kit_houses_asbestos.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/metalix_cad_cam_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68e310e-2a3b-465d-9e83-637bfe0c347b/63040948016.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/fluid_catalytic_cracking_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6597b9-549c-40fb-a490-e7be79588c3d/south_carolina_drivers_license_change_of_address.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/82419116992.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/how_to_become_a_dentist_in_canada.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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 5324 bytes
SHA-256: f6911da6376a9b906c3971b25a65f36e9fddcbb5e3450635834c7cecbdc3aca7
font_01_sfnt_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 10124 bytes
SHA-256: 9d2c2926f3d8fd1eda0cd56688977535c2a8b3f15ca26997295d0d702b51dd71

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