Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb5db7649986582…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 21:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61de6432dbebb700ba46f20f245a01c8 SHA-1: 03b1538f2731e724c745f91babda89b62116e87a SHA-256: adb5db76499865825a05ed3fb23c9d2feab7e3042d0802ff10e367ab903f7af6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing or malware distribution schemes. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's used to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=launch+x431+v+apk+download PDF link annotation
    • https://hsiaoying.com/userfiles/file/dituzon.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/tukasejazobosoga.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/92169046734.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/41325105488.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780f654bd3---16432739258.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/durilozipevoz.pdfIn PDF document text
    • http://identik.hu/editor_up/18355451292.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/jukakisuva.pdfIn PDF document text
    • http://gotween.com/userfiles/file///xelona.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/93717380716.pdfIn PDF document text
    • http://tchid.net/userfiles/file/6383506064.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/52748268670.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210911080042.pdfIn PDF document text
    • http://teknis.it/userfiles/files/65589688129.pdfIn PDF document text
    • http://jarosi.hu/files/file/57017859290.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090201515479.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/gunegirikizikofeganozog.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fiduxevoboxuja.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/71806978374.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/82556488048.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/tejusozozorefavi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461d30bd5e8---97159651354.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/95133583677.pdfIn PDF document text
    • http://sunway.me/uploads/file/152044556724.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210917102541.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 18216 bytes
SHA-256: 6606ccd3a71a998ec1420ae1620012084706202fff147bc61e2c06be9f07c831
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 10724 bytes
SHA-256: d83a7b66de2179cc0c7d95654b811a53144099fb2fe6ffbaf56c30d2a253b4dc
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1