Malicious PDF — malware analysis report

Static analysis result for SHA-256 8019d11b7164e824…

MALICIOUS

PDF

76.0 KB Created: 2021-05-23 18:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 611b3d1b39a574de816969292269a447 SHA-1: 480456e7b9f2cc27859989676b8dad65c2002bb9 SHA-256: 8019d11b7164e8246c89368d9f25c87265b1e154f66e05e8df9af65ae81691c6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pelibifir.ru/strik?utm_term=pdf+file+resize+kb+to+mb PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ff8c7876be65.pdfIn PDF document text
    • https://nirilepewo.weebly.com/uploads/1/3/4/6/134657632/e45d3a1f2cbb.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/bb8f2a04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ff34bfacb57d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ffeb75995bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487399/normal_6007c58706079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60184e8ce0b49.pdfIn PDF document text
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/dururevakaf_sekitefilakaze_rikuzufe_fidexum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_602078d101d9a.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/e50965e38866f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_606ba9bc33294.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/nulenekewidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_603b9348f2b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_6016c3dd4a762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c701e30-973a-481a-a05d-0ce2a07a0efc/45089456236.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/mewigezogigakexatav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96827e76-e691-4248-a845-9643a23814ab/67360448690.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/16607981945.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/bugdom_full_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/bbc_life_reptiles_and_amphibians_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/61152427395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41407668-2198-4f82-987b-ba00098c106d/positive_psychology_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642e082b-f8be-4096-b4a8-629f4b22e151/how_to_draw_a_reindeer_face_step_by_step_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/99495302115.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/mask_of_the_red_death_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/92712961864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301e5326-65fe-4f25-8ecc-774de6f1e6b0/bawinom.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5096 bytes
SHA-256: 767772f4c96cc88f2de5d453850ab51afedbfdff9bf7eda052ecd5a2258080f8
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 10884 bytes
SHA-256: 4d5fbe35c87d93550ccc0b03d56a2ce786581db3a3483f0dc4154dfd5e467c48