Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbe246dd9480bd2…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 12:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3a8caf2329dbafce7ef151aaab1b3f61 SHA-1: 6ae40a00e096848e9caf33c9493bf477276c1186 SHA-256: 0cbe246dd9480bd28751b795c4b43e081bc49d78469fe32766ad3dba2a7a6432
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to PDF files on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to distribute malicious content or phish for information. No scripts were extracted, but the overall structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.delaneyllc.com/ckfinder/userfiles/files/93994959561.pdf In PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/5593980629.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/rovunivi.pdfIn PDF document text
    • http://4rrecycle.com/files/file/zuzufejibezezelanumuk.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad855afc52---saxapuwokibo.pdfIn PDF document text
    • http://muszempilla.com/files/file/nilubur.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/nixuvapuliwalibojus.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/wugawovalapebajale.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/pipifosok.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/ziruneragufasil.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/50432619849.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/koguxujuzikavexufinuxu.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/71908703044.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/33457024344.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/80736465834.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/diwutudesigukefewotupetiw.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/dezodovaditelezisu.pdfIn PDF document text
    • http://ametansk.ru/uploads2/38501028406.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/94611230758.pdfIn PDF document text
    • https://phukienbep.net/media/files/bugexunojizigisuge.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/10/01/kufusuwij.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/gogumofifu.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/58483981054.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/4681023767.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b62d56c9dc---97532492761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+learn+asl+appPDF link annotation
    • 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_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 10228 bytes
SHA-256: 99ef6a2d1e66322a0c44ac3cf0200eddd727387af76b1214c6e061c251ac47e9
font_01_sfnt_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 16488 bytes
SHA-256: 4ee4a506119e11d42ef892fd632cc8ce100f7ea9ce08e580991bbf817c723990
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1