Malicious PDF — malware analysis report

Static analysis result for SHA-256 de24090cf86a3023…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 23:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acc4a97327fc30967412062cbd34c375 SHA-1: 5c9814339e3db82c36d05673c195571a004b4889 SHA-256: de24090cf86a30232b33d3605b7d2a0d90bc4a4d1955eeae6907eda325ad0b6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous distinct domains hosting PDF files, suggesting an attempt to obscure the final destination or distribute various lures. The presence of many unknown reputation URLs supports this, as they likely serve as redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://panoramabyty.cz/content/60483860085.pdf In PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/31484821622.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/topiponitokefa.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/ragojatixun.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/mexewimuzixum.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/25957077008.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/46984392081.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef0deff9376aab8a282c511c766b9fdf/50831744368.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/75899546748.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/ragewi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210910055016.pdfIn PDF document text
    • http://esipro.be/userfiles/file/22137436164.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/93541022339.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/xodamojopuboxam.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/98526132323.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8fed268cae554fab7733ddf707a0d022/73064752316.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/22498637431.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/71836587613.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/65331888265.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/fabajolaveluz.pdfIn PDF document text
    • http://winso.tw/userfiles/file/jisijanodarenaxarotok.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/86311082180.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/81672709917.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/dirasatim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+the+time+on+an+android+phonePDF link annotation
    • 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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 18192 bytes
SHA-256: 6818316c2414b6afbcd03061b2a9eaf7cab7a9ba277ecfb7e3d503e5218733fc
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10688 bytes
SHA-256: efb94ba6eab7a5eb355264e711120394d66021d4fb8384f359d8cfd18dc8a122