Malicious PDF — malware analysis report

Static analysis result for SHA-256 228ce74662ce085d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 16:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98c2c26e6dca50d3a65bb1f484e11237 SHA-1: 8f8b1b7ca5509d11b692a8d3b25719a11e19af5e SHA-256: 228ce74662ce085d9206e46d17af20aaf9f8977da2a239c9a858ee47927a69e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving external resource redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=read+crave+online+free PDF link annotation
    • http://namadagaskare.ru/ckfinder/userfiles/files/woxowopedotilogusofogubi.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/232234010.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3q4pp2adubu8fba0g42dved6a4/kunefijexomijenuku.pdfIn PDF document text
    • https://orangerun.re/photo/files/baxogidazinimidigige.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/48536735573.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/jajuduzologubugokaxuf.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/keketiwa.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8ou3ionfv8f2k3m410gb58pmnv/74054758253.pdfIn PDF document text
    • http://evola.it/userfiles/files/muxotosulagozezuwape.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/86513713633.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/marinakadem.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/subep.pdfIn PDF document text
    • http://travellerisland.com/files/gikodigugotifat.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/79250376887.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/40110671555.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/24072252535.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/8035478755.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091011102_367080043.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/kekitugafazekorab.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/xofageninumagomakot.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/22389832463.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/vapipan.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/32647849064.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/43710973104.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/zofifokej.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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 19220 bytes
SHA-256: 6b77273815c23d881392f4777ad1be4f4405d8bdf6a96bde229059e00530c4a3
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10316 bytes
SHA-256: 5159ec0ae868bc0edacfb577397b47ddee2115f82278b53540f45a3d983fc55d