Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bfe5529d03ee06…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 05:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b424c27444056423869dea7728b9c103 SHA-1: 49bf7e24efc6ca280cd4d2740d7b6ca8a28b4e5e SHA-256: c4bfe5529d03ee064b09d2c238b3c9c83877d60b6984dbe342faa7b073bada63
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://queure.ru/uplcv?utm_term=pubg+gfx+tool+for+android+11 PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146ace9b3e6f---49779287191.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/gusajitogazodopimirogukub.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/66260740594.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/guzawipusujexegif.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210913191047364227ibyav.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/32897698472.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/xazagubu.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/6161592429.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/99365462575.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/35476209321.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///nubufinamawos.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/junitifezixarolowas.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/baparumavovuxuroremit.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/74332181720.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210904_100008.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jivunegokir.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17532762546.pdfIn PDF document text
    • https://finliz.lt/i/File/lutewabe.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/ruvoxunalexiva.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/68012988125.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/lokusegadig.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/76082392244.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///filaku.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/14106290241.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_off0000b361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 10624 bytes
SHA-256: c2835a1dbdcd6ce36ecedc9232fdf8bdeb93ac0516870eca3a63a0aa81db3f82
font_01_sfnt_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 16184 bytes
SHA-256: e2f9dc205ce12e5a51620c373b34500add81c99c8ad78de595ec09fb0c5fa5ca
font_02_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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