Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c154e99d193b27e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 00:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3832d321b97ed988f928278ee0a7ec9 SHA-1: 3d2cb110c2b3d5f34d2ed7d96536d081a930ec2f SHA-256: 3c154e99d193b27eb8c1da18502a9d78960088f952756852af8abef614d5f1ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

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 http://gat-asset.com/CKEdit/upload/files/30848393011.pdf In PDF document text
    • http://ukkies.be/userfiles/file/likakabigiwitu.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jivudozofilij.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/gusanafoxewagepaxinegitid.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/9159773543.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613342af682ba---9398306575.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/63559673460.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/53575053378.pdfIn PDF document text
    • http://scarpatti.com/files/22293117469.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/57748431798.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/46606599436.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/16242321837.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/95142127931.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/71748162543.pdfIn PDF document text
    • https://sainaudit.mn/File/vowodesajoze.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/48145228799.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/55982560774.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/madupu.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/73071697009.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/40122762859.pdfIn PDF document text
    • https://il-gusto.com/images/file/subodutegis.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090815323637.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/biridotidemexerax.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1668268808613fa3e85c206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=binary+to+hexadecimal+calculatorPDF 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_off0000b675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 15264 bytes
SHA-256: 82d86fc29c3f29cfbad101b90d9177c600f090ca69658861d898bcc0d625f991
font_02_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 10836 bytes
SHA-256: 5cdb9d285af5d5bfce48325dc7b24c64cfa2a9a61726d339db8e0e5be3d28a92

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