Malicious PDF — malware analysis report

Static analysis result for SHA-256 7715b73c44bf555e…

MALICIOUS

PDF

77.5 KB Created: 2021-06-09 12:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0a1a4cae6d57933c25a8be27275d01 SHA-1: da982f3d350bfd62ba0fb10de62454fb648c51a4 SHA-256: 7715b73c44bf555ecfcc5a8b477fa1e76172a5cfc9e05d0ab8e2ff2a1a102d18
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, with one prominent URL leading to 'kuzutuzo.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=bubble+bobble+mac+free
    • https://cdn-cms.f-static.net/uploads/4467287/normal_603aaf56c5bd4.pdf
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/e549603.pdf
    • https://gozajajemitala.weebly.com/uploads/1/3/4/3/134325553/perojoburalupali.pdf
    • https://radalumimobexod.weebly.com/uploads/1/3/5/9/135957078/nagivotigunegipujak.pdf
    • https://cdn-cms.f-static.net/uploads/4490542/normal_606948845b2ca.pdf
    • https://cdn-cms.f-static.net/uploads/4401972/normal_600d267e1c5f7.pdf
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/1706696.pdf
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5fc815334eadb.pdf
    • https://cdn-cms.f-static.net/uploads/4368500/normal_6037b03070c5b.pdf
    • https://pelifofenap.weebly.com/uploads/1/3/3/9/133997555/dexoketimazaj-nuwulone-zipenudavoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jowenoxo.pbworks.com/f/94519763092.pdf
    • http://jolunatimavu.pbworks.com/w/file/fetch/144714444/legixalevisetozo.pdf
    • https://uploads.strikinglycdn.com/files/425149f2-c617-4509-a8b9-aa72a46a8bb0/summary_of_ramayana_in_english.pdf
    • https://uploads.strikinglycdn.com/files/9731d177-f140-4fe6-9217-91bd1892fa2e/tabekisovifamazaxewikafi.pdf
    • https://uploads.strikinglycdn.com/files/3ecc8a51-262c-47b8-9520-69c1a84d57b0/how_to_remove_garbage_disposal_rubber_splash_guard.pdf
    • https://uploads.strikinglycdn.com/files/e9bca272-bf00-4c47-ab5d-2929fab7ae7f/como_hacer_un_panel_solar_casero_con_botellas.pdf
    • https://uploads.strikinglycdn.com/files/8def737c-9e8c-476f-8dba-3204a191711f/how_to_hang_weights_on_a_ridgeway_grandfather_clock.pdf
    • https://uploads.strikinglycdn.com/files/46198131-66c0-4da5-8c85-213cf53597dc/9135002044.pdf
    • https://uploads.strikinglycdn.com/files/d0683879-bbc5-4096-b99d-eaf7e69f21ef/gemokemojiweraweli.pdf
    • https://uploads.strikinglycdn.com/files/6e802b75-ab29-48fd-83e3-b076857c48e4/zimbardo_the_lucifer_effect.pdf
    • https://uploads.strikinglycdn.com/files/f36d9bd0-5d57-4604-897e-ed3162b14afb/how_do_i_reset_my_toyota_odometer.pdf
    • https://uploads.strikinglycdn.com/files/2ef1f287-3782-449c-9eef-6e50442da98c/penny_dell_crossword_puzzles_la_times.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_off0000f362.bin
43a293dc346f8e0b0086280422e59c2c2d3dfe535f4fa6b7c14bbd289f27d6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 5036 bytes
font_01_sfnt_off00010473.bin
67bef26f32706df61cb05c1155ec4037f70a73904ecc4f4b933e2896fd31c080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 10544 bytes

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