Malicious PDF — malware analysis report

Static analysis result for SHA-256 d740e9c4853be9df…

MALICIOUS

PDF

93.1 KB Created: 2021-03-15 22:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e202b9564a2527da4d7fa3cd9119183d SHA-1: c46393f030a57cad7423a47b66605d41592daadb SHA-256: d740e9c4853be9df76d0cac877cee3956c29ba3656e1f92269b3e471b4bfe4f4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a callback lure, prompting users to call a number for issues related to billing or subscriptions. The presence of external URIs, including one pointing to a link farm, suggests it may download additional payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/wix?keyword=good+games+website+names PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455374/normal_600da33888cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_602541e478381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5fc66755e4ee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fcbc7751de2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ff4cc32da287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_604b92460f12b.pdfIn PDF document text
    • https://milolavum.weebly.com/uploads/1/3/4/7/134717842/63fd314f5fd8.pdfIn PDF document text
    • https://mozawexi.weebly.com/uploads/1/3/1/8/131856146/dozututuvape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_60311263ba6b2.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/tamil_movies_free_full_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_6009547701244.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde337e7-e575-457c-98e6-947d1e390d70/mugako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3390f081-e058-42bb-887b-27a8676a1305/what_does_pearl_symbolize_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66f1bac-1331-4223-ab37-d5627cda4520/methodical_deception.pdfIn PDF document text
    • http://jabegijazuxag.rf.gd/joomla_admin_template.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/air_conditioning_system_design_manual_ashrae.pdfIn PDF document text
    • http://xubejivulovitam.rf.gd/58649602057.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/41727896986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a8fbd6-90af-408d-93c6-f0dfcc04cce7/50677174989.pdfIn PDF document text
    • http://zerujafulo.rf.gd/concatenate_function_in_crystal_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/xuwavinamujasu.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_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 5280 bytes
SHA-256: d1b756919584ba098ca0b72438659724ed317876315934337b6f6259b46ece75
font_01_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 12012 bytes
SHA-256: da05e89e31e2cdf9fab58b72d28e221a694ccb29483ec12f094ea76be51c9ec1