Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10db1c6e1b8100a…

MALICIOUS

PDF

73.1 KB Created: 2021-03-29 04:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f806f44ab3cbebfc8283acc8ea68224 SHA-1: 2c193973eef781ff00834f5491bf4c9f992ca651 SHA-256: e10db1c6e1b8100a7ed2e6f00ae6e035131dd9ef7deeb1e14c0e0f79e56dfbfd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to generate SEO traffic. One of the primary external URIs, 'https://jumiwimov.ru/strik?utm_term=why+dogs+are+better+than+cats+funny', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=why+dogs+are+better+than+cats+funny
    • https://cdn.sqhk.co/gixotagokezu/ijQx9ge/56030476649.pdf
    • https://cdn.sqhk.co/wipedekis/eVNsaaC/zombie_3d_gun_shooter_mod_money_apk.pdf
    • https://cdn.sqhk.co/nudizodi/QmJyhdy/ice_princess_lily_movie_2019.pdf
    • https://cdn.sqhk.co/gutinisiv/ggUPRha/22821190959.pdf
    • https://cdn.sqhk.co/tuwetebep/themPie/yahoo_weather_api_python_example.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zupenafud/2148142122.pdf
    • https://uploads.strikinglycdn.com/files/69e0f880-195a-4e3b-a362-5fd11faa683d/wegozojeri.pdf
    • https://uploads.strikinglycdn.com/files/2c9e0a5e-fa9e-4efe-a35e-6b9c31d462e5/the_bluest_eye_summary_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/10db4028-b17b-499f-a2cd-6ab641fcd9c8/tuvarokonox.pdf
    • https://uploads.strikinglycdn.com/files/81f28816-e22f-4a15-af1e-2be47057c40e/samsung_rs265tdrs_fridge_not_cooling.pdf
    • https://uploads.strikinglycdn.com/files/366c41ab-366a-4667-9621-594645e89364/learn_korean_alphabet_online_game.pdf
    • https://uploads.strikinglycdn.com/files/a25f7290-024c-4e2a-8acf-76b6042cb975/79655976064.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_f1325c11e8f94c46aac59f128ae87c04.pdf?index=true
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_6478462cc0af4cb28b9124f0dfc0dd4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3cbd8755-e0ff-4c2d-9a99-d11bdcc3c07a/maluzajab.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_af875f617f734cd6921483b1c7fc461d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b8024cd-f708-4451-8e8e-d72b573f4aaf/exchange_2013_to_office_365_full_hybrid_migration_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/32719ddc-8da1-4374-b4d0-70f218fd01c6/94330820584.pdf
    • https://s3.amazonaws.com/nowokil/73646768893.pdf
    • https://s3.amazonaws.com/bofake/tapoxikuveboduxaxisud.pdf
    • https://s3.amazonaws.com/wobuzisibal/8841369906.pdf
    • https://uploads.strikinglycdn.com/files/3b5a1fc7-4bbc-4628-bdc8-6b030a4aae4d/27018729772.pdf
    • https://uploads.strikinglycdn.com/files/e472e0b9-2683-4da4-a8e2-267ecb969ec6/ego_lawn_mower_service.pdf
    • https://s3.amazonaws.com/jadere/yamaha_kodiak_400_parts_list.pdf
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_94adcf21ff3a49769d1ebbf781f337cd.pdf?index=true
    • 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_off0000ddbf.bin
cc2d3ef5f9cf486a4f1f79a70642bbd823fde3b83fc12e8e0ac2bdfec19c048e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 5508 bytes
font_01_sfnt_off0000f08d.bin
e21ef21cc5e8be011a5a71e1e8627cee5e3fd3d2f08aa6164b3569a82eedf7cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 11192 bytes