Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c361b9905da9e5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 10:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 00e63deeb43ad8724f813093242d41e2 SHA-1: 28b28355c8d3471796e05fcb9018a5e31901b6ae SHA-256: 04c361b9905da9e510c04886b179e7d8cc9dac446528fa92d432a61ec5edb6b5
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=zip+code+bf+international+las+pinas PDF link annotation
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613255592b2cc---93331658981.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/34268760044.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/tudedegaguxolefixuragu.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/zabirepanut.pdfIn PDF document text
    • http://cudicio.it/images/file/97420466648.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/45868023964.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/tovugusobega.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/12050358764.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/xiwikakafonolafe.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/18791165186.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/saduxom.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/jafanobajononiwipowin.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/nitexufokuzudobifokod.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/76793893762.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/fomukuwu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ka2fgsrnvkmhqqki619gihmn6v/xodizipetamubedijawetir.pdfIn PDF document text
    • http://kasand.com/userfiles/tuzivujorigekaxepinizu.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/53317951048.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/30410910393.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/23996718862.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/20278769551.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/satatakurisu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/namuf.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 10716 bytes
SHA-256: 0ea698d6df03cef0d4d82d843ed4efcb4a693c80475c11f783e3e34f263225e7
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 17836 bytes
SHA-256: fdd70cb20f18b9d7b7b8bef3dc9a569034de05046f1fc38958caf72d67a8d85b

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