Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63ea079547abaea…

MALICIOUS

PDF

97.2 KB Created: 2021-04-01 15:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af37c4f1c278784b32a95695dabd32bb SHA-1: d943b188f99f738c48647d9b3b29db7395f17df8 SHA-256: a63ea079547abaeab101546edfa282fa91eb73df01f7affc0abb432ace9d2607
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/wix?keyword=accuracy+and+precision+worksheet+doc', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to an 'accuracy and precision worksheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=accuracy+and+precision+worksheet+doc
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fe46423c406a.pdf
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5fcd6e87b0453.pdf
    • https://cdn-cms.f-static.net/uploads/4383165/normal_603ea67c74c53.pdf
    • http://mikazuxo.mypressonline.com/iron_door_design_catalogue.pdf
    • https://gediwidamavuluv.weebly.com/uploads/1/3/5/3/135348022/ketaza_kipirexotum_xixegajafofok.pdf
    • https://cdn.sqhk.co/bamosabubesi/idnhaie/sijisibejujuzotativemip.pdf
    • http://mopexaxurip.getenjoyment.net/solid_state_chemistry_and_its_applications_download.pdf
    • https://cdn.sqhk.co/wazafanez/0hdidhf/38794110458.pdf
    • https://guxitodek.weebly.com/uploads/1/3/1/6/131637279/cb920c0.pdf
    • http://derifupiwa.mypressonline.com/lumoxijopekefimog.pdf
    • https://damemebu.weebly.com/uploads/1/3/5/3/135316778/poxodirupomopenune.pdf
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/guzuwobedupa.pdf
    • https://cdn-cms.f-static.net/uploads/4379723/normal_60185529e11de.pdf
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5ff776c76043a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/46da305a-8d49-4575-9820-c68c96a969fc/nivilowinalisevejonulaza.pdf
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_bb93088550f0433181598666c0545dbf.pdf?index=true
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_9f01cae661974a38879bed39fceece7b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/65bd3d4f-fbff-488e-842d-b592b75d5cea/8513175559.pdf
    • https://uploads.strikinglycdn.com/files/b91d5feb-396b-4a3a-9009-8225169fe2e4/naziferojopuwigakot.pdf
    • https://uploads.strikinglycdn.com/files/00f2359c-16e3-4550-bffc-c025dc3401dc/why_is_my_hitachi_tv_standby_light_flashing.pdf
    • http://vilepobafomunow.atwebpages.com/pogutiwukolisukasebifased.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012882.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 2828 bytes
font_01_sfnt_off0001327d.bin
09b12c744a79a115dff57efc6c313b9f709927e0491735336b34e6f69c1c23e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 5256 bytes
font_02_sfnt_off0001446d.bin
bcf739fb211e942556fbfb6f0d4f1fb6cd5ca919368c4e9dc4d6f7a1432e308a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1446D 10200 bytes
font_03_sfnt_off00016701.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16701 4324 bytes

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