Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb4e0dc77669bd3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 03:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d05fdafc2486c0d6b6668416210e670 SHA-1: 3438445ed200ebf44d56190ccec34eb0004d889d SHA-256: fbb4e0dc77669bd32c4acba3ee64a700a3418815f1992c6899bb3fdee7c5e82a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized nature. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to external sites, likely for malware distribution or phishing. The presence of external URIs and the link farm heuristic strongly suggest an attempt to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://garglob.ru/uplcv?utm_term=apk+of+pubg+mobile+lite PDF link annotation
    • http://condominiobrisasdelnorte.com/userfiles/file/vavuruda.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/55452400779.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/71858808634.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/vowopalupabik.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/11438668884.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/zixilog.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/luredugafipikafitizidix.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/mobeki.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/wijoxamu.pdfIn PDF document text
    • https://kimcert.com/E/file/loxegebonivobob.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/somiposatenosimasowu.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/95411422877.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/xelof.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3484cbc7---51999366080.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/petovunavej.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/lipexobedebokagef.pdfIn PDF document text
    • http://koutingchina.com/upload/files/11032690715.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/dibib.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/2716688087.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/36877919547.pdfIn PDF document text
    • https://cartolmania.it/file/bajebuvoxebomajabaxifef.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/20707872612.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/saxanuwujorawikuvele.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ec22201c---41853620354.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/zidatazodulafi.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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 10480 bytes
SHA-256: cfdab789c5db89b712d80b4df136268bce2a8348907143906a75dbfc2f5de4a4
font_01_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 19256 bytes
SHA-256: 7f1f9d306be32f13a9ffb11364776623f06812764b8caea0a9bd69ca0fef7d7a
font_02_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1