Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e2e25dad9846d9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 01:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a46a8a2ba85e3d10904bb179b137fe02 SHA-1: 6b91984db2585f538f1db7a526a28a56e357169f SHA-256: 93e2e25dad9846d93e0e8c4d74a3e98eb02b3bb135006347bb49702dc9f83962
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are flagged as suspicious or unknown. Heuristics indicate it functions as a link farm on disposable hosting, and ClamAV detection confirms it as a phishing/trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=agoo+la+union+zip+code PDF link annotation
    • https://baglab.pl/galeria/file/tixuxelopovalivazokagosoz.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210914173007.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/7498797287.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/tineve.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/panidajovar.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/57557211606.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/xibosusojozuvawixidag.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/gepavubat.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/fovokafemisuteduve.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/31183745315.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/41708583387.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/filaz.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kixegujag.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/82444243072.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/mobomijetujufev.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca3a557bb---34256867819.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/worejazivodalab.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/25040666519.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zomuvugak.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/wurij.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109101318591019.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912235219.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/gekudaxexadanipisenuvir.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/54602323123.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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 17836 bytes
SHA-256: 49e9908561bdef710393ecd03f90267cac41e0bb6708ec4ae04a999e30382010
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 10464 bytes
SHA-256: cce47e634b68c0939d2774da435fa0116e62dde51139642a4f569215ff0924aa