Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbce50bf43c7a2a5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 23:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2ddfc80f16b2d1bd51d1a095aae4247 SHA-1: 8718c6a60ca12e319368b0ea484d8ed00836b432 SHA-256: dbce50bf43c7a2a581b0f6635220291f75541c1c7a09c03e0ab6ad9e5fea3edc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. The presence of many unknown URLs suggests a broad distribution or redirection network designed to obscure the ultimate payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.gpe-el.pro/ckfinder/userfiles/files/72434632919.pdf In PDF document text
    • http://mamaskitchenorder.com/uploads/files/5695226744.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/pikebo.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/goxutukik.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144355c0d463---66686679988.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/moxopiri.pdfIn PDF document text
    • https://ferropula.hr/files/digijaxoxokarevasi.pdfIn PDF document text
    • http://zamaro.info/images/fcke_files/file/8689190984.pdfIn PDF document text
    • http://domainecomps.com/documents/files/74447138577.pdfIn PDF document text
    • http://twilaw.com/files/files/66034538310.pdfIn PDF document text
    • http://askort.pl/Upload/file/27153910911.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/vorisaxalifanosufaluxuna.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/68283476964.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/vaxovoverodukijunom.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/novaxanajukovijaw.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/80483818954.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/15434186619.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/6634522106.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/wadorogijegodi.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/zoxidowidugowe.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/3603537666.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/runakazamunawukomuxusop.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/48959792407.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/69048564937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=remote+pc+access+androidPDF link annotation
    • 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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 10672 bytes
SHA-256: 68a3ee864d05ec227592ea3362d4cff0535bdc0069e7669ff81bb7aba0cf418b
font_02_sfnt_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 16576 bytes
SHA-256: 1b83f223dc7a25cd8e845597d73644fc6ca973d41efa48daebafd2a9341782f3