Malicious PDF — malware analysis report

Static analysis result for SHA-256 973c8a2d214d024c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 08:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96efaf8a585d4d36d6883bdf8703c4e3 SHA-1: ce5ba670ec4de1717bba94f94bc79512308e7e1a SHA-256: 973c8a2d214d024c4459b01b112e76a104371590c91f5b8ba945bf140fe7e0f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It utilizes a link farm strategy with numerous disposable domains, suggesting an attempt to obscure the ultimate malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deliver or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://clairvoyantinfotech.com/demo/images/30489024296.pdf In PDF document text
    • http://cjatkinson.com/userimages/41016850255.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109051012319695.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/wejilenozuwogajez.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/22874429335.pdfIn PDF document text
    • https://menu2uplus.com/images/file/nutupimimiwe.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/65263509064.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cj9bl3nfj7pndefg2inm023pl5/fafona.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/39777145857.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/45955699989.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/zulapenawitekufiworebu.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/gololotubotukidaf.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/95033851221.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/xogogetuwisa.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/loviwupede.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/rugunupare.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613459600a2b0---dugubixokomafe.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/45172621425.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/gexufizidorikogunet.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/92971439122.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/begedozimebuzig.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/20808765510.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/duwoxejokanoma.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/29733701215.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/boxijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+episode+apkPDF 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 18660 bytes
SHA-256: 41504205ea5472ee23afcd8edb54b80cd8c271057c12bfe847d79032d83258d8
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10368 bytes
SHA-256: 29aebf213b127d05f0827d604a4f26ad4a9935b91ad599240b88b84537e0e4a8
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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