Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0f01a3e96c5d4a…

MALICIOUS

PDF

78.3 KB Created: 2021-10-01 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0272bc05262c0a7e19793896df318a6f SHA-1: 300e95572c8f708dfdb03160509cbb9c0fb3c494 SHA-256: cf0f01a3e96c5d4ad3b9c62c49ad83e8da0ae8b9ed565138b244819f9ea6b281
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vstarmp.cn/upload/files/20210929_190004.pdf In PDF document text
    • https://macronew.com/upload/files/kasapalakenizikokoru.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/89030649354.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/52568345550.pdfIn PDF document text
    • http://ihdbd.org/upload/files/4103388334.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2583fd70---dinoraboxenor.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/70649984897.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/28051412787.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/jipokolinazexeji.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/kepuzewowuzowisukiladalag.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/kilexirasumibo.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/gozexokobirajigozesujowu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/60940328906.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/9788171414.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/76798906819.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/50301964463.pdfIn PDF document text
    • http://cascad-trans.ru/files/68927634895.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/sagizutolavuzenefigurinof.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/67223828375.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/50992333335.pdfIn PDF document text
    • http://metzgerei-bischof.de/userfiles/file/xaveruganepubizozotixatin.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6022e354---78469721977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=meluha+ke+mritunjay+pdf+downloadPDF 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_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 19764 bytes
SHA-256: 7c5eb2858d78b732828fd2c73cdbcc01dbc7c6b7640b08230cade5c2145e79b4
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 11108 bytes
SHA-256: 27211678a1c7fab7b4423a2920339a4bf025ca5ed3a7dbdbc87caf04e47621d0
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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