Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e74bc795c784a6…

MALICIOUS

PDF

79.6 KB Created: 2021-03-30 23:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2748bce8a3af1d5d3de0b7e76eb3a296 SHA-1: dcea9ed87c512252047e135c1b9f7e9087e74584 SHA-256: 45e74bc795c784a678b69ee9eec164eca7256652c0cb407b45a2c7bb8972418f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised with SEO-friendly titles, indicating a link farm or phishing attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to interview questions, aligning with the lure used for the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://botokaw.ru/award?keyword=chemical+engineering+interview+questions+and+answers+pdf
    • http://sluzhba1.net/prendimiento_de_antoito_el_camborio_englishluuly.pdf
    • http://jefuxifutubanal.iblogger.org/igcse_physics_summary_notes.pdf
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/5656f83064.pdf
    • http://fotobaruti.22web.org/first_alert_smoke_detector_9120b.pdf
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/5744718.pdf
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/jaxeraxixitajeregiv.pdf
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/aba619b84c6e.pdf
    • http://nanupigib.22web.org/tuzitakalusiraxirimi.pdf
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/5948757.pdf
    • http://peludofnor.fun/55557133711ely9u.pdf
    • http://nosetibadap.iblogger.org/askfm_mod_apk.pdf
    • https://guxozagubixox.weebly.com/uploads/1/3/1/4/131437827/xuzifalofowax-sitaxokep.pdf
    • https://wirupexulabajes.weebly.com/uploads/1/3/5/3/135322132/2211275.pdf
    • http://lojisaka.22web.org/drawing_lewis_structures_practice_worksheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3452b515-6de8-4961-9589-b9c34f18e4ff/rosuraxezuvugiwobepelo.pdf
    • https://uploads.strikinglycdn.com/files/d5bb0c43-4519-4f3e-a08d-08b6a5a71caa/44714637119.pdf
    • http://sejedusodumevu.epizy.com/benim_hocam_ayt_matematik_kitab.pdf
    • http://timevexow.epizy.com/does_chiari_malformation_cause_dizziness.pdf
    • http://nabasuxogakuwet.epizy.com/38269146684.pdf
    • https://uploads.strikinglycdn.com/files/f3fee7ec-38c2-46af-8f90-6239bc0af59f/realspace_magellan_hutch_assembly_instructions.pdf
    • http://wokonudiru.epizy.com/can_you_share_a_post_from_linkedin_to_facebook.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_off0000fa72.bin
4c9dad95695dc5e0ee58e1b1133717ebae5bba300a6236cda99be56fa5870e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5752 bytes
font_01_sfnt_off00010ddc.bin
659506290fb5bd9371e5290ad60bc7a262f70cad895a4e154397b88ddc11cd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10576 bytes

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