Malicious PDF — malware analysis report

Static analysis result for SHA-256 d038efabb4917505…

MALICIOUS

PDF

76.6 KB Created: 2021-09-13 13:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e407ab8193eb0a6760a1f66abc91aaa SHA-1: c0af620de5a95cc348c13d947576bc6cbe143db0 SHA-256: d038efabb4917505b44a401642ddc45b61604419b20f720e4cf5e8d5f6fb88b0
134 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 external URIs and is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=android+disable+ads+in+apps PDF link annotation
    • http://ozdoby-betonowe21.pl/Upload/file/50584499350.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/38475347367.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/mululatologasarup.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ehl0vtks7v72mkqmcnjni82dru/64966614189.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/senesefufituxamekibal.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/dolapesipededoziwuxafurit.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xofupokipagedizinofe.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/17430616166.pdfIn PDF document text
    • http://caythuocnam.org/images/files/ganexalamizumafozoruru.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vevosaz.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/27303227394.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/maberovuminaba.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/variluzurunajes.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/14025529112.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/11924263688.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/varegutijawozowewukomu.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/kadesa.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/bowijosumedi.pdfIn PDF document text
    • https://ghnservizi.com/file/45799979025.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210905_6A85AC12DDD446FA.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/bivukobalexav.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/12366917637.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea6a13716---20560221194.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/bevakuvaxopivapubegetoje.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210906060247.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_off0000ca9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 10408 bytes
SHA-256: 7ddf7e7818b6ba506702ca5aa38e5d6b58cb455a43742b1985044ac3b5a118c9
font_02_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 16520 bytes
SHA-256: 0c699437507848722d8255c3321a6505553c546edb862685efdb84128b8cab7f