Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba07e00f67b89cec…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 09:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7a83c2850d96dd9cf6fa7d8b58955b02 SHA-1: 5ee86410627fc1847416c42668b406c09465086b SHA-256: ba07e00f67b89cecad17242b9f1509de00597a215087e12d1a4c823d073016b3
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm with 30 external PDF links, suggesting an attempt to manipulate search engine results or distribute content. One of the external URIs, 'https://ponafet.ru/award?keyword=articles+exercise+for+class+5+pdf', is directly embedded. ClamAV detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and an ML classifier assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=articles+exercise+for+class+5+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490266/normal_606595bcecca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_6036aa9511be9.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/Dngjict/gukovodevoxurivasesisigas.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/hjP77hi/ms_state_parks_map.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/Bm6ehi6/traffic_racer_cheats_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/ehbM6jd/asteroid_belt_definition_astronomy.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/sigA7h4/badonelas.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/gowebabuxogiro/ajay_devgan_new_song_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/irrational_beliefs_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96f609b-65d8-4fe8-87d5-094dd5714441/396251491.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/baby_sleeping_bag_temp_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399f40e7-d19b-4f3e-b712-38cde97160ca/philips_-_btm2180_bluetooth_micro_music_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4799b94-0c83-404f-8dbe-a37721c88f2d/tiguxanofusonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a2f77b-b178-411f-bb49-d7f74e10d509/nimatosoxarawiserava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fec0c1-8cb4-4c04-9cf3-50b199cfca6a/which_keurig_has_the_largest_water_reservoir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224a287e-b151-4378-b8b2-3275376eff56/63705266257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea5e918-538e-4416-9246-ff08af90ffb5/exponential_organizations_examples.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_abde90f0ce5a46bba862af25d35cf045.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c16cebb-3057-478f-9da1-5d0604e3c4e5/29884399904.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_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 5332 bytes
SHA-256: 647c4fee2cccb2b249008bea6b9a91155f73094b56b05ae2c4d9b9cd45b21962
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10732 bytes
SHA-256: 71e191ad652d64fb817e596beec8a0713da8e322cc9d4a2703133de58ce80d69

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