Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcad7b23d9a76976…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 01:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a55fba2e19c7fea063e5d30c6db8fbc SHA-1: 881c63020fa59e48a80f74f80333503c0650c44f SHA-256: dcad7b23d9a769761081b629e4940cf5eca44be1c8ec1cedde475d9fdbe93fc9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a link farm, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of many external links indicates a potential for redirection or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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 http://k2plusinterior.com/userfiles/dofirezom.pdf In PDF document text
    • https://ls-machinery.com/uploadpic/files/202109022151137364.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/42507591462.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/96797587731.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/98072203715.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/bogizipefivul.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/metibavoxigilun.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37164807640.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/49330207441.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/beturudegasakuset.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82466735196.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84862696508.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vuduta.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c09603cd5c7c11d7a431873b5feba3f3/dinuwesab.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/73996725118.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/32085407255.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/menevisar.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uht4k6n2maakq67aibh8l15aqm/72132559558.pdfIn PDF document text
    • http://xsteelstock.com/d/files/pikejasuwu.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/85371344934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=databack+mod+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xazofekafifurilixoro.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_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 17856 bytes
SHA-256: cef3d06a7e18dd67ea149fb6fb225b149b1038df042bd3e53e5efee764a421c8
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 10268 bytes
SHA-256: 5756f9e3f4cda873637cc1f9abc74dc0277b32918fd6ae37630d1ac131d53fc3

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