Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2c4c99a7ae69b5…

MALICIOUS

PDF

81.3 KB Created: 2021-04-08 02:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d206a0d73457dd0e4dc412554713c89 SHA-1: 81b32cee5ac7a53e1b1f4d2fc61832d1f3ec498a SHA-256: 7d2c4c99a7ae69b54196e1d56e68279bac86c9813943aa632a1c56fe3ec9c0cc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'kuzutuzo.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/wix?keyword=2004+ap+statistics+free+response+questions+answers
    • http://arendagg.xyz/how_to_release_britax_car_seat_strapsss2md.pdf
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/2a9a5457.pdf
    • http://geesecam.com/what_is_project_manager_softwaresqrbe.pdf
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/xiluwimavi_mafojos.pdf
    • http://sport-stavki.fun/cyperaceae_family6feap.pdf
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/8f10e55e9cfd.pdf
    • http://j3vnci4.xyz/unix_rm_vs_rmdir4dpij.pdf
    • http://nolaxevoxuvelij.iblogger.org/other_friends_steven_universe_piano_sheet_music.pdf
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/sefematizexuvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d64a4d79-9f30-44db-a36b-ed49496d0b6d/how_to_activate_tableau_license.pdf
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_a589745147a248f59eb686309c209a2f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/601a748f-8244-48f2-9710-938a55680b08/manhattan_prep_5lb._book_of_gre_practice_problems.pdf
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_f6ac3e5a694a433ca541bdf46c3b97d1.pdf?index=true
    • http://ritarejameja.epizy.com/79680924246.pdf
    • https://uploads.strikinglycdn.com/files/b63a7e63-5fa6-4281-b691-e6d4e7e3b61f/how_to_start_crochet_magic_circle.pdf
    • https://uploads.strikinglycdn.com/files/b1a5e0fc-f95a-4c20-881d-aea0b9223cc5/ledopezijezu.pdf
    • http://jasagovobol.rf.gd/50570412596.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_5218c02d162a4012a10c6f5d2974f3db.pdf?index=true
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_1aff3997643d46e5be20b82ee0ba77a2.pdf?index=true
    • http://zoxukawozo.rf.gd/xerox_altalink_c8035_manual.pdf
    • http://xedonufil.rf.gd/61879410942.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_30eb21644e0e4eecbe720d5e139eeb9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b73fe04-d353-4120-a20e-b6776c95f161/33256161920.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_off0000fe31.bin
ed2117e983826b59bac9b7cca505cb17e2dfbf3be941f1f99c5ecb628c31dcab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 5464 bytes
font_01_sfnt_off000110f0.bin
2386693874816c240c9dcd58eabd3dcf7a5c171f5056cecf39d73bff75df86a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 11320 bytes

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