Malicious PDF — malware analysis report

Static analysis result for SHA-256 c464d9c8ae9ef12b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 22:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb325d92ca611d67600a3f9ffbc5cf54 SHA-1: d96d3a1494458297c2938dbe0f67253746cb13e0 SHA-256: c464d9c8ae9ef12b3cc155f6d1cf3997518c071aba116a789925cea5e28a3520
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect users to malicious sites or download further payloads. The document body, though heavily obfuscated, originates from wkhtmltopdf, a tool often used to generate PDFs from web content, aligning with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=2012+football+game+app+download PDF link annotation
    • http://laptopcuhaiphong.vn/upload/files/mitaguwedonakof.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/86405093381.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/2274738673.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/77225768368.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fowemaxidixedojanok.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/jupigolisolugomamapamumo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/9296998623.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/darafeduwu.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/67855677032.pdfIn PDF document text
    • http://artio.pl/files/files/zaniteto.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/talokuzododabuk.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/18486582431.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/67299287423.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/10283582385.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8d0b4f634837b6c24ac37a891d52bd55/55923439565.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/17478030346143cd8830830.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/mefolowosijavopuwemorupu.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/zilusebafamaz.pdfIn PDF document text
    • http://husplaza.hu/editor_up/20629849800.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/94300725054.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/bejomufudififenig.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921141452.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6f35654f---venupiniketokevajaw.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/jodofi.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/lozojamupetuzijufekuto.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 17280 bytes
SHA-256: f8d34cc69386784ab9fc44ea0b6fbd84b780774930d063b0988f727ac03e7800
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 10904 bytes
SHA-256: 68767c22611bcf056e96d32552aa3e455450b11debca09de0400bf82a5d1fedd