Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9847c7625b1649…

MALICIOUS

PDF

68.0 KB Created: 2021-02-14 06:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da80193a51931b08499c8ba17fe4c761 SHA-1: 5899c26fcdc857fba807dc5fe1a2d71de9ec20ff SHA-256: df9847c7625b16494c83034ee5e1518b4413014339912308371c46960ab0e82f
134 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=manually+upgrade+usg PDF link annotation
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/5332536.pdfIn PDF document text
    • https://rixemovupel.weebly.com/uploads/1/3/1/6/131606965/somovinimepi_bapibixe_mudamon.pdfIn PDF document text
    • http://titoto.xyz/matemticas_avanzadas_para_ingeniera_oneil4q2s3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5fdc3bfc6ced8.pdfIn PDF document text
    • http://legrand-spb.ru/vusovajievz5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5febf6bb0b0a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_6005ebc2f396f.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/ib_chemistry_hl_textbookpxpq0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_601b607c82647.pdfIn PDF document text
    • http://ita-talia.fun/kumimawaqcw.pdfIn PDF document text
    • http://securityverifiedservices.com/zowusogusipvylyy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fe75e0042a7a.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/d1ee4ac83ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/balochistan_plateau_information.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_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 5236 bytes
SHA-256: 38d049a7d60290a9242cbecc1fe3ea4251ca56d36268be430938b882044746a7
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 10720 bytes
SHA-256: 2b6ddcd4fc406aa2a3789b3f5e09d3ecf0a2b913e9c766e87a8771477923b0e4

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