Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d84a21f7e3c8e8…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 02:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8369a018da863a28dfde6f6e3c480a3 SHA-1: 2d2b2479b5a268e17cc96ad005a778e2399fd1ef SHA-256: d3d84a21f7e3c8e86613c12be440bc9f36825d0367727ef2514c3257f4de665d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • 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://drafthe.ru/uplcv?utm_term=best+abs+app+android PDF link annotation
    • http://tavio.su/files/file/jokadezok.pdfIn PDF document text
    • https://haidangpc.com/contents/files/3757702703.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/16994271684.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/13605204214.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/11377794463.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pikewugi.pdfIn PDF document text
    • http://xsteelstock.com/d/files/gerevavu.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/xosodebidokerinuguso.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210921013617.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lisetepud.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/8865776844.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/vovem.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/13430118376.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c16e5af287---34193811948.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/57828646269.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/zomamuz.pdfIn PDF document text
    • https://conrays.ru/f/data/zolixidejefonemaner.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/gemimutexitivesigem.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/34273525114.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jopozabibavomaxiwafeb.pdfIn PDF document text
    • https://ptogel1.com/contents/files/23315758521.pdfIn PDF document text
    • http://belean.pl/userfiles/file/74833199083.pdfIn PDF document text
    • http://chromavials.com/d/files/57080282972.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_off0000ac06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC418 15276 bytes
SHA-256: c196a0b06d3152334958206f8b91ea3209371dff10b1498303b381f37378e9b5
font_02_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10532 bytes
SHA-256: 4f1b4b386a1ef61626c83df9b8a2d0d1ef90e91197cb9e9c5b22eb9d26d79bfd

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