Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae679b085d70c25…

MALICIOUS

PDF

78.4 KB Created: 2021-10-05 04:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a250a4bbe981680a20f534e1a8c5c524 SHA-1: b2adf81e01c2844c30f5faccaf34ed124f49071f SHA-256: cae679b085d70c251e1ef60dd66f37301d632579161161a568ece4a9339981ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, further supporting this assessment. No scripts were extracted, but the nature of the PDF and its embedded links strongly suggest it's used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=having+difficulty+swallowing+food PDF link annotation
    • http://clinicaveterinariaalbese.eu/userfiles/files/18550706871.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/kiwapetamikefivuru.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/tewili.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5bl52ssgaal998dfdpmr4el8k1/xodipasolotej.pdfIn PDF document text
    • http://sadhankendra.org/erc/media/79503943348.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///butoporebajol.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/4188331791.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/takowifovaxugitov.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/10456119500.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/firikopowibinufatozej.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kimidupobuvazasujanigu.pdfIn PDF document text
    • http://www.siposferenc.hu/html/sozekosupulopuvaloduraxud.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jozekidajobimimur.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cfa839765---8447918199.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/95426139212.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/59066140879.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/gikezasanisivozowasawip.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/nujubakamizo.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/koturekub.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/tesenagopalatajodu.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/44829201106.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/rukizizogajirawivixojot.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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 10776 bytes
SHA-256: b2db9d9608977641e4d30cc50d761a01f530879011af7205a3c5c8d03c765b96
font_01_sfnt_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 18212 bytes
SHA-256: e4013d63f4cd378a40ec1531ea98de3bedab518efed1e3777f89fa546a3f20e4
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1