Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d23d6e78f2fe40…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 09:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b4d90ce814ff90a6ee4660a820ad2b5 SHA-1: c6f959ddb88b916c577129d7e0167d322ebf5d67 SHA-256: e6d23d6e78f2fe401f72a7d30597e7d8104092250c2ac4a227eaa86b195e1666
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=toxicwap+2020+series+download PDF link annotation
    • https://broadcasthub.com/ci/userfiles/files/3678287908.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/bakuzolav.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/45564323476.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/25231616798.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/najasamovozezel.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/rikeragusezi.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/wetawanakazi.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/29431233869.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/88809502860.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/29076431758.pdfIn PDF document text
    • http://htygroup.com/upload/files/musigiposawikep.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/998cd6e62c1d27a679f73aa0e5556c17/dozumokodosezilizi.pdfIn PDF document text
    • https://sim2007.com/files/66090213347.pdfIn PDF document text
    • http://headrepublic.pl/images/files/rotewuvasupalasujuve.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210904223021.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210907103355.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/mefamijotezika.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/31653521580.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/susexuvufabubigake.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/96763705828.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/74518379598.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77f67b371---lojukajeziwobajuritozaba.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/rafilefiseridiwerakuso.pdfIn PDF document text
    • https://eguiders.com/uploads/22725759111.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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 17384 bytes
SHA-256: ef994f7e10b117be5a0c3b3af73828f21d4beac4fa5a341c23a76e1da47a2c63
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 10804 bytes
SHA-256: a6ea51ed5d78ed6bb276ce62e15c8d6f1e3528bb033a9fffc4b0806ecee60bfe
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1