Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74ca2e2c1fd9f20…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 06:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4e216f749337b455be8a264c91a8b98 SHA-1: 613abf2739b6dbd5e3ed8a07d10c704170b0d62a SHA-256: e74ca2e2c1fd9f205879a9f027bb2282be40d0e433cf73ea0eb6dcacce799812
174 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 disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=distance+meter+apk PDF link annotation
    • http://deeringbayrealestate.com/userfiles/files/temifotigefuzesidujesoje.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/32952021537.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5mckboc6asc3lg5lht3j16sa9b/mikofedexixerolitamolifur.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/bupixakenololovotuza.pdfIn PDF document text
    • http://web5gstore.com/Files/files/18614596849.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/92443308552.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/56043997728.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/vuxawerimaxotot.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/9913775004.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/lugipijexabukaverimumajos.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/todetiziximaru.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/tewodekoz.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/vilebuxi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/85199897443.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/renekorigadaluruw.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pavebadir.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/zenigolimamosajuwugojasun.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/xofufexul.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210904_82597C0B716E00A9.pdfIn macro / runtime command snippet
    • http://relaxzenter.com/uploads/files/9372304177.pdfIn macro / runtime command snippet
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/nezezirawikuvobufakoxuxu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/vufenonebarumotax.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b1397ad1---85366580713.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/tunokuwefokulul.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/53707722137.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_off0000c5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 19476 bytes
SHA-256: 9a51bf03f849b2de3df915aba0fc6b3243f86d3f57c5af7b102c8ae8996b6712
font_02_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 10464 bytes
SHA-256: a7ae6c2002450e9a122db3d14ed38ab41c546bf35e48c781005ccef9de1a0000

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