Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0797e52aa6d686…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 13:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1dfda7479dae15ab38693557d48c7eee SHA-1: 22b22525f1f0864660c720752e71afcc1c81152e SHA-256: be0797e52aa6d6865d36f7d89c11f4f93e8bef4cec703fa7051a55bfc49036d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, suggesting a phishing or credential harvesting campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://smidgel.ru/uplcv?utm_term=common+core+algebra+2+pdf PDF link annotation
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/molone.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zaxobosurezagafejonuwada.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/17249257000.pdfIn PDF document text
    • http://zuszdounky.cz/files/xelofologijetom.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/bapusanulekisememosufu.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/durakazepafefuf.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/23127232102.pdfIn PDF document text
    • http://aweibel.com/Photo/file/ridukeli.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210901083824436809n7ri4g.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/84768487100.pdfIn PDF document text
    • https://tsegypt.com/file/77704305672.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/kamenefuvironisabiz.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/73828379018.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161425334a0747---gudigokof.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/19228294498.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd3270c99---46199254687.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/84925059107.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/86429214072.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090123192573499.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210912_C5E137C642B99863.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/zogemitarokazowawoko.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/duzunavu.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/bakekubipefamusuxapezusa.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/70803978417.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/88577063620.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/rulugaxed.pdfIn PDF document text
    • http://tianfonmm.com/d/files/luxetejuzegumigod.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_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 16492 bytes
SHA-256: 6ee44b24ab553e35ce9826df5e1f96fb92da3efbb95a067beb1bec0bb1c7de55
font_02_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 10896 bytes
SHA-256: 04a2356f68bed4124d25a72fea22caffa3e299031685326182b190914abbb9eb