Malicious PDF — malware analysis report

Static analysis result for SHA-256 8357a898140b2352…

MALICIOUS

PDF

67.7 KB Created: 2021-04-02 01:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43c63b0f507715a53661ec0e3762bf3e SHA-1: ec729608e02b9983cd59175854d42126f5eff3b4 SHA-256: 8357a898140b2352467aa84a2f0dbd28e7fc1fac15a32fc8e5b8754689025da3
104 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely intended to trick the user into downloading malware. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support this assessment. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jumiwimov.ru/award?keyword=alagappan+5th+edition+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fe81e5e3a148.pdf
    • http://gebameguw.iblogger.org/91820238585.pdf
    • https://cdn.sqhk.co/nefikelifu/bjEidgg/mewuwemazitamiwosonora.pdf
    • https://cdn.sqhk.co/wudawagirus/BKupjfs/thor_ragnarok_costume.pdf
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/7169366.pdf
    • http://xexisutufas.iblogger.org/amines_nomenclature.pdf
    • https://static.s123-cdn-static.com/uploads/4392659/normal_5fffce3cd9706.pdf
    • https://cdn-cms.f-static.net/uploads/4381108/normal_5fdb560a41684.pdf
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/6149107ac5.pdf
    • https://cdn-cms.f-static.net/uploads/4383470/normal_601441f34aac5.pdf
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/dorimajoxul_sexipatizoduji_lisimabofazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b10693b2-e6e9-4c10-b65b-14ce6cd6f6fb/98202017033.pdf
    • http://kodiwukelesore.rf.gd/bisepofasudut.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_720de8e49ce44524b09a11dbb1da57f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a79fd72-6a79-48f7-8b9c-0cdee69ee832/meade_autostar_497_update.pdf
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_b52108bf72134dcda9079585a34e06b1.pdf?index=true
    • http://kokegewabero.rf.gd/temisedajubazinegako.pdf
    • https://uploads.strikinglycdn.com/files/0e7266f2-22be-4d52-8d46-eaea326cead7/29999030813.pdf
    • https://uploads.strikinglycdn.com/files/22193ff9-ca8a-499b-984f-4b3f58796c93/section_62_law_of_property_act_1925_leases.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd10.bin
3143e85b9b712eedb40eb36fa1c89f781c0ab12ce587dc46280155de37657cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 5332 bytes
font_01_sfnt_off0000df46.bin
ffba305baa7c4f333fe39802400793d5831783898b088b6bfd8a4262a6094046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10080 bytes

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