Malicious PDF — malware analysis report

Static analysis result for SHA-256 0debd80789251d00…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 13:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33ad4e6383256c07cefe6017625c43f4 SHA-1: e2f48b2f679187bde7f5715fb533c37bdf248012 SHA-256: 0debd80789251d0008a9d59b9ba4e3fd7aa08ae703a2d0c3cf30b6b69f67e88a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://ketchas.ru/uplcv?utm_term=watch+fifty+shades+of+freed+online+for+free PDF link annotation
    • http://mstreatmentadvances.com/userfiles/files/fuxepinabanawiwolako.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/watexewafativura.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/tumugujamoponikuvil.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/4035996604.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/91517201794.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920082130_15isxa.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/kipinevidajeparemivefe.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/51614642856.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/47785039188.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/23574734359.pdfIn PDF document text
    • https://funbugs.ie/files/file/54894948101.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/koxep.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9b877360---48354237626.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/bomebujedimusepuwez.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/robukagebesop.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/91874364365.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/latorukigevofa.pdfIn PDF document text
    • http://apicn.net/upload/files/doxuvo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0dau94gbnqs348f13gi4ifv630/82692565030.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/19492597672.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/37420767173.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/94312239473.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/32713329150.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/wevixazetaxozenomubu.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/73445943851.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kututopopififusi.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xonon.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_off0000bdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF5 16528 bytes
SHA-256: 7b9e48c39d3338d28027bf92cb98db25b48d901b6e2b26f4d629df699aa0209f
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 10680 bytes
SHA-256: e585f49636965f354ccb01166ddf247fb340c4c0305bda163f7e8499d731870f