Malicious PDF — malware analysis report

Static analysis result for SHA-256 7693a127b1e0a4a0…

MALICIOUS

PDF

92.0 KB Created: 2021-09-18 16:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82b3257492b0e902784d533f56f63113 SHA-1: e5d8b71d56230946630e5d9dc3693d1ed4f83226 SHA-256: 7693a127b1e0a4a04bebbdbd0047c199a3f7af9ca32322ea3481f5a944cdb1fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware-hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=new+english+file+pre+intermediate+pdf+student%27s+book+answers PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gv91d750cc1okf2050j9jibjan/65222289447.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/riwax.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/linidepimukijuvarawam.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/96310037869.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/34465048786.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/85933366325.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/25167083816.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210909_033407.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/sedizi.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/16276674811.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/25851816301.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nalikevovizowoza.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/wowuviki.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/fizizimobo.pdfIn PDF document text
    • https://mcsfood.com/images/file/54390958698.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53416911339.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/398028888.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/mapafuduk.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/figuduwizavu.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/7624822168.pdfIn PDF document text
    • http://lulanjina.net/upload/files/30175945941.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75969907475.pdfIn PDF document text
    • http://rts-3.ru/upload/files/36915873337.pdfIn PDF document text
    • http://rcmo.ru/upload/files/56473495981.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/35578491481.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_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 11372 bytes
SHA-256: f3fd4cdd9899be0febcc4834cfb010ceca0d13044ce492d9766e894a9179a0c9
font_01_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 19560 bytes
SHA-256: 4507eafc7df2a38b4d096963c114783fc6d9c9a0788826f7793227942ae8d143
font_02_sfnt_off00014970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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