Malicious PDF — malware analysis report

Static analysis result for SHA-256 3432575d24487d90…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 21:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9eb8086bd85edf884718f0a26389bcb7 SHA-1: c305d91d699808f1172178721dfa350755552ae7 SHA-256: 3432575d24487d90299c6e984c33d38314f55a9474fcdef36f9156027039d7ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=symbian+games+for+android PDF link annotation
    • http://agisinfo.ru/uploads/content/files/22734865883.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/79192336994.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/46522689979.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/masijituxajovoxuvape.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/fiwavovefexusa.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/mepijuvuvijulefetuwitubo.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/72530167370.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/nukaperikanumabi.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/balaximutimusuwajenagi.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/xifelumafi.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/80605963070.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109251113145191.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/62924651597.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/vogofi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/93247684273.pdfIn PDF document text
    • http://strandedtattoo.com/file/22488364451.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/44795630238.pdfIn PDF document text
    • http://healthywithhart.com/res/file/24114236957.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/bekifivizemojigikibiwo.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/nuluwuwabolekifeb.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210923074430909.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/mimexataze.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/nebuberanukireni.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/52042712664.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_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 10884 bytes
SHA-256: 5cb97f958b3e89591ee06bfbb31535fa3b6425e9f55ed29a14378d0dd11ab0de
font_01_sfnt_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 15860 bytes
SHA-256: 450c6bb4ac913799b8c71b6a4545a65332040a2823407bdf63c61c986f8e69a0

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