Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85ff8a884cc3c6c…

MALICIOUS

PDF

92.8 KB Created: 2021-05-23 10:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ea17690b2eac8ee7a4924a05f09362 SHA-1: 2e760088a96f8e8e2305849560533f51262a80d4 SHA-256: f85ff8a884cc3c6ca6c4f855985afe3b1e012d7d5e9dde0a3e4ed462d67f3d50
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document that contains an embedded URL and a visual download lure, strongly suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification confirm its malicious nature. The embedded URL likely leads to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dafemum.ru/strik?utm_term=circuit+builder+gizmo+answer+key+activity+b
    • https://static.s123-cdn-static.com/uploads/4418991/normal_6000a4e8aa7f9.pdf
    • https://cdn-cms.f-static.net/uploads/4445881/normal_604d422f1b239.pdf
    • https://static.s123-cdn-static.com/uploads/4453103/normal_5ff3316e73e52.pdf
    • https://cdn-cms.f-static.net/uploads/4445739/normal_60110c0f02309.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6042236ceb739.pdf
    • https://cdn-cms.f-static.net/uploads/4380086/normal_605284322e751.pdf
    • https://cdn-cms.f-static.net/uploads/4420767/normal_600b1efa3ef4a.pdf
    • https://cdn-cms.f-static.net/uploads/4417213/normal_605236b398d4a.pdf
    • https://static.s123-cdn-static.com/uploads/4501057/normal_5fdd9aba24f51.pdf
    • https://cdn-cms.f-static.net/uploads/4423171/normal_6060c84f25b70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/816a41fe-0532-4670-879e-8000fe8bd55e/82664626888.pdf
    • https://s3.amazonaws.com/gizonukorad/67629022162.pdf
    • https://s3.amazonaws.com/jemisajoda/2015_chevy_ss_sedan_manual_transmission.pdf
    • https://uploads.strikinglycdn.com/files/96189c81-cf3b-4af9-9449-6fe87a6d5121/64305474469.pdf
    • https://uploads.strikinglycdn.com/files/663dd7e9-4baa-44a4-81d3-a9b9a09e0d0b/99719702101.pdf
    • https://s3.amazonaws.com/migivewuwe/android_app_development_course_online.pdf
    • https://uploads.strikinglycdn.com/files/f92a80ec-c738-4900-8442-1dc7cbe799d8/how_to_reset_kitchenaid_built_in_refrigerator.pdf
    • https://uploads.strikinglycdn.com/files/70aa27be-fab8-436e-8aff-fbf510eed590/inheritance_in_c_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/3a19fe90-8e5c-48c2-9db5-1df56c2c9dfd/52312280247.pdf
    • https://s3.amazonaws.com/joterige/14983814583.pdf
    • https://uploads.strikinglycdn.com/files/9292e188-dbab-4d65-ac24-faf3188bc271/is_shimano_claris_any_good.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011187.bin
e473df64a26390914dd1649e546e95bb608acdb16bda55763f89ed7b446fdaee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 5672 bytes
font_01_sfnt_off000124d8.bin
9eff850b7e74254e30c087aa20d750620f815ddbd3c670fc84e9668d96e6f590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 13652 bytes
font_02_sfnt_off00015050.bin
2b7ca7a93ad53e610cb389f46f13be85bc7a0aa1e3ea4795954ed03e913e9597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15050 16112 bytes

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