Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cad683ba9781e11…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 12:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2318fa019a3e04351a3c05d31bb4fa35 SHA-1: f722a0b5a361b1b3d389d9d9ed9a9b3b10a192f5 SHA-256: 8cad683ba9781e118f9d610468f0386078d306baaa3d8fe1fffec3e9875c298c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=venom+1080p+dual+audio PDF link annotation
    • https://barcelonacentremedic.cat/files/galeria/files/24437813112.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/dogimubopitafite.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xepiluwifesidujizidixixoj.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/6458370321.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/vikofeneg.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/60983857074.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/25256be85d1f7330ad54a1b7a4781150/difuwopibix.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/96831846042.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/45572353108.pdfIn PDF document text
    • http://cartopack.be/Images/file/10432531591.pdfIn PDF document text
    • http://wmsone.com/eimages/file/raniwirutavobewuxekap.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/tafezu.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/71302913596.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/47986901335.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/sajuvoruvanorovelosejat.pdfIn PDF document text
    • https://norservis.info/files/files/pefimutufebitupi.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/taduwunizu.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36521335844.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/kuwovebarewaburok.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/fafinejikixuwikid.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/negijuba.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/davevijobutaluzidalogor.pdfIn PDF document text
    • https://peterdegendt.be/file/52685737424.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_off0000b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 10640 bytes
SHA-256: 58fba6bd1cd7c4ca6b9d3cecd204f2ca6008785cf990349ec28a0d90ffe23de3
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 17828 bytes
SHA-256: a0bcd9893ba56bb89201378f0092f2b84c86809257647cc83426b7f8cb148eb3
font_02_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1