Malicious PDF — malware analysis report

Static analysis result for SHA-256 82423420ebe0d481…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 05:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ce49613a276c97c78a412e62dbe189a5 SHA-1: c6455927c235a3ac042c467ffd1f03ee87fc2811 SHA-256: 82423420ebe0d4815f6d70d588819c39423cc65cb3e79d9fe0eb107323dce585
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=123movies+harry+potter+deathly+hallows+part+2 PDF link annotation
    • https://jungleflightchiangmai.com/Uploads/files/bunemuxazoxedapinavi.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/pepakanetexakigakoxuzo.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/zivuralozoxebukewip.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/genatodidegoxelovatuwo.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/wefurolutiw.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210926070156.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/lejope.pdfIn PDF document text
    • https://atiksigorta.com/files/37628974983.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/24679885059.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zovuxadosep.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/jivamimub.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xasofekonupefefudivam.pdfIn PDF document text
    • http://tulga.ru/editor/files/73233490701.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/ruvotewolotesirijevebed.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/60942392034.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sesibir.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b176fa42bc---72057784907.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e6f1365bff5c06550b2577570ac11ebe/rafopowogenunalawa.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/71342859734.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/jusomidulalebakomadaju.pdfIn PDF document text
    • http://tencanpowder.com/d/files/30155881986.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/naferidakotalusafeze.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_off0000afb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB7 11068 bytes
SHA-256: 040bb76ef7bb6dc9a5c4ea2be0a42c4736c1238aa9959887f39c2de92d8e2f1b
font_01_sfnt_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 15616 bytes
SHA-256: 05aac62d8943e35238c49fca34c2f215038a9b42ab739403b1600644a14af6af