Malicious PDF — malware analysis report

Static analysis result for SHA-256 8243ad5c621b3b23…

MALICIOUS

PDF

70.2 KB Created: 2021-09-10 07:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1a998192a05669fe675ab944112ad6c SHA-1: 503376a829a38b15fa6d0b8e1e903d98d1463b0d SHA-256: 8243ad5c621b3b2377646f40e3ab2fa023683b78be491ac0ea9511ea8a4e9885
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including 'https://infrive.ru/uplcv?utm_term=cast+my+chrome+browser', suggest a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=cast+my+chrome+browser PDF link annotation
    • https://quangcaowebsite.vn/uploads/files/bazolabemefubisexut.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/sonugeva.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/16990040691.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zonego.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/25904580531.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/duvasorazalegamik.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/widoxowisaxe.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901173113.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lavekejasowedomi.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/weruzenezemaviwuxum.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/62267903426.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352f0f3bf64---jesinumugomasisu.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/nuredabikifupova.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/malivejafavedudefusoko.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/58362633937.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/97856025606.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/72112162793.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/5387185462.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/dogabigonelozugukakajilar.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/27250604714.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/fobubuxubuxiwibebeneke.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/takilefudebobolovuduwix.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/roruge.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_off0000b31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 10624 bytes
SHA-256: 6c176f77a94f04642bff83ece72b0eb45824fb3f02fb8b87f8fe7ee8ab8c8eaf
font_01_sfnt_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 15464 bytes
SHA-256: 3f12965f049c063bbd5dd28e9ecc8128088ad0796bfcd475d015fdf28ad7ef4a
font_02_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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