Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe3a874ff602871…

MALICIOUS

PDF

115.8 KB Created: 2021-03-25 12:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 440b1fe1c50e78200227897ebbcd5feb SHA-1: b1acb5bf497a609dacc743c69547801454197607 SHA-256: 0fe3a874ff602871f9915d17c1e05e0884f603a7a37591874959f21ca7f931af
136 Risk Score

Malware Insights

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

The PDF contains a high-confidence heuristic indicating it's a phishing lure for free downloads, directly linking to the URL 'https://kuzutuzo.ru/award?keyword=arm+risc+architecture+pdf'. ClamAV also detected this as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL suggest an attempt to trick users into downloading malware, likely via a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=arm+risc+architecture+pdf PDF link annotation
    • http://wafapolinan.iblogger.org/sorot.pdfIn PDF document text
    • http://mylic.ru/social_media_video_er_appvpfw5.pdfIn PDF document text
    • http://opensol.xyz/46680326200na8xd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fefbee97a28d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5fc66b85a292e.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/systematic_software_testing.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/xejaneli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6012b1d33de16.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/jandy_salt_error_code_120.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/jurnal_ilmiah_pendidikan_agama_islam.pdfIn PDF document text
    • http://vijokezomamem.iblogger.org/vubarisukobukorox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_604b4e6d9755f.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/cellulose_journal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fdf2b31b39c2.pdfIn PDF document text
    • http://freud.icu/pasemucqwq5.pdfIn PDF document text
    • http://winoorama.website/foguzasugigavosozusoma73ta.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
    • http://bonejaje.rf.gd/footprints_in_the_sand_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/cappuccino_song_video_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/vibejot.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/22306577885.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/nirupebe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16309 5020 bytes
SHA-256: 560ea67e3d002682987db3008de2c011c198a9a2245afefa9779e6ffac19dbfc
font_01_sfnt_off00017414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17414 12216 bytes
SHA-256: 9e48548bb84d6c92e8328c60839ec0990fc5de285b1e9163c9c541838f6de63b
font_02_sfnt_off00019df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DF0 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61
font_03_sfnt_off0001b2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2EC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f