Malicious PDF — malware analysis report

Static analysis result for SHA-256 892ab82e88f67093…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 15:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d2022096b14b0ce5483591def43a8c8 SHA-1: caa2cf52b4afc4bc73ce65cc0ad8cece8d1efcc9 SHA-256: 892ab82e88f67093548a6185ff5af49e5073540ebd947455fb7f07857d15a772
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=first+name+and+second+name+meaning PDF link annotation
    • http://icaalliance.org/filespath/files/20210904090515.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosagifuzatitadeludizax.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/lidujuzafal.pdfIn PDF document text
    • http://millecolori.it/images/file/31616912062.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/muvujunapeva.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210906235249105.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/35953700263.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/delosusibadopufape.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1829336883.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/69a77e2202fc8e1e5f07ba4fcdbf977a/26939075116.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/70672523834.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/24536da5ed1d374f193ccc47e8f609da/parodiburomesirobegodiz.pdfIn PDF document text
    • https://cargobull.cz/res/file/jiteda.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/duxazimiluxu.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/98372020878.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/30162270061.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/60247994664.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/79359502477.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/13459295199.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/rokuzogubawutagowute.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/54062850670.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/lodivixiroze.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/surave.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/goguruxumasakoroniv.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/38092188830.pdfIn PDF document text
    • http://qdcmd.com/data/files/gopujaratumekakozoku.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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 10644 bytes
SHA-256: 17fd4c22ac0374f2a5a51f5efa5888e3e08f97ad88e79f3e924bcb560c76702d
font_02_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 18548 bytes
SHA-256: 3105d3fffa66cb27c66e60675e2b3a7df6e80a8a0b96aaca0dff8882603e8f53