Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ad68244700fa0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 02:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14d533ac9de14c8a27154e0f49a51892 SHA-1: 6f5b61ba059e853467127abc1ec78ddccdb79f84 SHA-256: 869ad68244700fa087311313f16e723c0d0d133492463448ff33cbb84b72186d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs that lead to disposable domains, suggesting a link farm designed to distribute further malware or phish for information. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://balbu.eu/uploads/news/file/tamogogetixokabegozo.pdf In PDF document text
    • http://sakesushilakehavasu.com/uploads/files/6878063633.pdfIn PDF document text
    • http://warehousetraining.ie/images/36172630950.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/85881735583.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/daxeloregakojunoxifif.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/83904731396.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/94465749164.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/38722496122.pdfIn PDF document text
    • http://classtool.info/upload/files/dozimaxosodut.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/67699882250.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/12473511107.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/xekuminu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a686f256c---tapavubovomugugunujage.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kidule.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/85417840659.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/rawidoguna.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/17377653692.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c02f49658a---fujufuvamemujudefetodat.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/41341058717.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/kubowotalivokisivupaseko.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/vawodefebipavixaboru.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/juvojotokinijoduwusiz.pdfIn PDF document text
    • https://begili.com/uploads/image/files/zimavepa.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/nawaluxelek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=battle+chess+game+of+kings+br+download+for+androidPDF 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_off0000af08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 11292 bytes
SHA-256: 988d69129ca631ae15944ac01086acca373274e833edf5a4deabde597ec49003
font_02_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 14740 bytes
SHA-256: e2c9983b55256eca9b87fa8c8d80849c2f39c1ea541cd0e6984f563f9e3d9d76