Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d82cf391e0f851…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 19:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a56aad8ab9d0dd9c163a492aabb018a SHA-1: f778f2b9d8820d419e755be1fe9752dbc0e691f6 SHA-256: 84d82cf391e0f851b0ac354282f445d4f9fa92f3320af75c720a89cf9e0e67e0
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 presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=weight+training+and+conditioning PDF link annotation
    • http://sanzmendia.com/userfiles/files/zaferugisumujozefev.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/63271316704.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/423758147.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/rugamojasivaxi.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fezumekaxen.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/banovilujoxofepibuxuzeja.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/budatud.pdfIn PDF document text
    • http://thepducphat.com/upload/files/55007609278.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/54712971681.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/jekuwazigomuxiruxep.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/9559200886.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/31302286564.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/suxidirolapevataxodinozip.pdfIn PDF document text
    • http://linker-apps.com/files/vopaxajotowadilimavafi.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bujizabulilomonuvag.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/39782241594.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/848c7262d83a89e7750169ba37b805cd/minedofevugorixewigalujed.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/74220104725.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/vozabozofizobepadapi.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/fufiluzekinigegobukofef.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/zavefinologofaxukek.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/perosozo.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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 10428 bytes
SHA-256: 30c722c9d3bbc72139b15dc6627a4c416d20c4722e79757db17c92ac2c045be8
font_02_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 15552 bytes
SHA-256: 7531970b5748cf86c66571c61abc39e1438f9d7194b9fafc6ede615b378497e3