Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a6e8148b51ab1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 12:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73ccafbb36a4431894445a12ddd80a75 SHA-1: e675dc648f12c58652f43d017afe8a6cebf2cc14 SHA-256: 7a8a6e8148b51ab1c0ed7e30a64d2b310584d61e9e56d59e8b44e52dedf67445
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and uses an invoice lure. The embedded URLs and the PDF structure suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature strongly implies a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=is+usb+tethering+the+same+as+hotspot PDF link annotation
    • http://usagimatur.com/files/others/kulefaxedibekenatelab.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/72988307750.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kulivazupogasiwafuvesar.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/81434581296.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/ziweruvugafemagiv.pdfIn PDF document text
    • http://underbutter.cz/download/foto/sagidelupopafigoted.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/gelukajofebamumitoge.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/lijanutotejewogidem.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xijedubuzapapoler.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/2414652180.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/e3c1d58b52cf22c30dba8a2758624126.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/24911211086.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613701352d33f---47603918677.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/melupuzuxu.pdfIn PDF document text
    • http://tfforming.ru/d/files/juwipozezef.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/21459539176.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/wevejugiwotisotugofewite.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/8865776844.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/46661306417.pdfIn PDF document text
    • https://12tiga.com/contents/files/62226095774.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/321229489.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/gizitowosu.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dujalitiladeduv.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/zofugibagijadivi.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/2820614149.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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 18000 bytes
SHA-256: bab42ad37535ad00d90513649cf4cf5a9931417b5c4133d6909892a04cf17458
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 10844 bytes
SHA-256: 565f5784d7d18b785d4bd489d357bcb7222bf9af7a3e3038601b5ef53648296f
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1