Malicious PDF — malware analysis report

Static analysis result for SHA-256 26eed25bec8fe8c5…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 06:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bef2470e5a284fc9e616f6e07e8cf6b SHA-1: 190d9589ef80569b78a60cca4483af7cb12cc081 SHA-256: 26eed25bec8fe8c5ecd8fbca598a48f450a2ba0cca0056be00a20b38f0814e44
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://infrive.ru/uplcv?utm_term=b612+pro+mod+apk PDF link annotation
    • http://pomodorolennep.de/gfx/userfiles/files/32714844357.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/91841567336.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/29114698314.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/bubaridelonam.pdfIn PDF document text
    • http://clingac.es/d/files/9605190864.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/11044637731.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/rumajabivoba.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/tusimibomujizunemutenolo.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/susarilojirumud.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/lelewatokoxobatetejinawe.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/jomevifazora.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3bc8b9215340db99d63c0ba3b2922f38/62063887778.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/garelus.pdfIn PDF document text
    • https://mikludava.lt/images/files/5869210202.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/42735818381.pdfIn PDF document text
    • http://zmz72.ru/files/file/fitujimipopisuge.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/33756905807.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/pivotojelilulitinulexoz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4b64a5f2ed7a5589db32d7550cc2b9d5/vuviluvabux.pdfIn PDF document text
    • https://ms1oke.com/contents/files/zefegilusunutus.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/xabiwoled.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/19332612845.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/87341005046.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/53188768954.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/80536195336.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_off0000b7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 10396 bytes
SHA-256: 1838ca1807dd115c59363712b67a818c84d7175e5590362bb9b33bd5c4b45502
font_02_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 18420 bytes
SHA-256: 397bf0bae14d5e8670866a9a420e80820974b819dde41581c35381f444b47897

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