Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d87db26f2af12e…

MALICIOUS

PDF

77.7 KB Created: 2021-05-24 07:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: adfb7728f6e687e0b4b5f6eb55e2daf9 SHA-1: e444f2e90cea0ddc8ee7a03bcc972be1bae966aa SHA-256: a8d87db26f2af12e2c302818ebc3c4a6423f8f1af343103f5b21e8eb5fc394f5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on directing users to 'xajibur.ru'. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malicious redirection attempt. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://xajibur.ru/strik?utm_term=how+to+write+a+radio+commercial+script+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389107/normal_604a73b9739ba.pdfIn PDF document text
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/mebiwonu-dazosururija-pofovexasimeg.pdfIn PDF document text
    • https://sawulazu.weebly.com/uploads/1/3/4/5/134588127/bfdb52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_601bae0052b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_606c90edd50d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_605b880ddb8de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_6037987423cf9.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/tatefu_jifaxi_jibun_livosowegisato.pdfIn PDF document text
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/4deb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2288a796-fbb6-4f66-a183-8e0cdb96b21d/fevejumebib.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/jomotuvazafonuvuzepak.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/diwejadaxidadaserubo.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/labitux.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/ecosistema_intercambio_de_materia_y_energia.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/us_army_corps_of_engineers_castle_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23790f2-b522-495f-8c55-319a54794131/after_we_collided_2_release_date_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4e2654-7a7b-408d-b938-9e2fbfdc007f/introduction_to_the_practice_of_statistics_8th_edition_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/world_cost_of_living_index_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/natural_high_bloodstone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/96586059914.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/lamugufazoduxux.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/72638660797.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/kezifix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 4956 bytes
SHA-256: 6e54a1f64cf2faa6d17fc80b9bd026a4358593c5b11c0cd0b0a7801f8f534e9a
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 11028 bytes
SHA-256: 08a0d66d0e2cb462012b7bdc14b61ca58b7c776c1df832290cb5575f4dfdd80a
font_02_sfnt_off00011aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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