Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24ab5979fe95a18…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 15:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fa5526c63359952262c55f0189c0e53 SHA-1: be1dc99c0cf162871e73d3308fc4b3a39978b8d2 SHA-256: f24ab5979fe95a18a37caa9d13c7552df7b1db6cbafe391db045bf5583cf3ea6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm structure, suggesting a malicious intent to distribute links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The presence of embedded URLs and the link farm structure strongly suggest this PDF is designed to lure users to malicious sites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=how+to+view+any+instagram+private+account PDF link annotation
    • http://rockycheng.com/ckfinder/userfiles/files/9391022676.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_54202A8A568B2AD5.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/57098301078.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/23782433788.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/madanageramejowopolif.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce1baaf2a---45924168098.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gixaruw.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/fijemuxotive.pdfIn PDF document text
    • http://bienbao.org/uploads/files/kajorigaxikazaniluwa.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/rasajazizutogebox.pdfIn PDF document text
    • http://attlas.center/userfiles/file/jivuxafedodefakosasato.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/jowamija.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/95908451388.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/pezolofagavabas.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/xuzodaxizewomorenewak.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/50400543882.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138707ab6ef5---tekutunik.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/vedosowajudufuvadenud.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/85272059317.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/78654328282.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/25394513964.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zamovixakuviwa.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/85343172290.pdfIn PDF document text
    • http://robedecreateur.com/img/files/2402216661.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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 11028 bytes
SHA-256: d615ac87a573e4fd7dbab4584f415a6af6aa1f02b775dfed53d9397d848f3171
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 18168 bytes
SHA-256: 1470382ea41dce2bc188de3e7e884c533f9af408960883c8add54fa1b8d431d1

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