Malicious PDF — malware analysis report

Static analysis result for SHA-256 c369a6d651e0dd8b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 10:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05a20dc4903c75ad7065fc67616fe56e SHA-1: 63a1ed03c9ca3be1c754f5a4bf3440924d929813 SHA-256: c369a6d651e0dd8b6b5c17e3d20cabe8e8d952052bad1459182fcd3fb6c2bdea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent through redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+do+i+block+a+cell+phone+number PDF link annotation
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/sumisotuzetilego.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3leg4r4dfkqe6migqtiebmot25/2802017824.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/11/jonitanesiruxorugiwin.pdfIn PDF document text
    • http://ombs.ru/uploads/files/wugubomejaruf.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/nofizamogofifuvutararugaz.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/nisig.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/52225074302.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/rizumedewonugesaboweki.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/gexigej.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/84676030852.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/nusemozomo.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/86281411833.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/66749944578.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/9328900084.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/26046258197.pdfIn PDF document text
    • https://tipresentoio.it/images/file/51525404946.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/xufunikefigosifopakudu.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/40414872801.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/ranokedezipavipita.pdfIn PDF document text
    • https://thietbigas.net/media/files/dusepisifesufobuba.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64228421486.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e9010f92---wavinelujulatiwujowate.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/wedigupovikepevataweluve.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/24407251944.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/39351260308.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_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 17620 bytes
SHA-256: 7c8516976723a0d2cdeba5cd824c8817cff6023bc663ba68ccd180ee8e281430
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 10920 bytes
SHA-256: 1de6a6eb0b50c7170c53f7fc7b99d0fd1ea6e142447c7b5b5db4848c0bc1571d