Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb96b58779ad1f3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 07:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14b79c80723cb916b3ed590392361bb0 SHA-1: c3666f364cd8019f22096a90a879478918d00ce0 SHA-256: fdb96b58779ad1f3da98ede787cccbcd2ed09b62f699cb0e60c7f8ab7cb4443c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document uses a cloud document lure to trick users into clicking on malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URIs and a link farm on disposable hosting further supports this, suggesting the document is designed to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.rify.us/cms-uploads/files/gewok.pdf In PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/norunetu.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/95152423489.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/56194412871.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/88949668729.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_04806BCCDAB6EE23.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/jabiximedawapi.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/50322191255.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/06d15idhjebphl3nhnp52uj4hi/11766374179.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/dokas.pdfIn PDF document text
    • http://castel.lu/userfiles/files/kuraxesabutarupiju.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c196b64d---kuvezojegud.pdfPDF link annotation
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xanirapugixanadibogipo.pdfIn PDF document text
    • https://thepainter.asia/upload/files/zobisefefajorekudogo.pdfIn PDF document text
    • http://email-database.info/userfiles/file/35303860508.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/jotina.pdfIn PDF document text
    • http://benetalent.com/upload/files/53068047110.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b707e1ca---58800077324.pdfIn PDF document text
    • http://villkasz.hu/editor_up/10902433769.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/lobavoguzanadavixukabot.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/vagovagedero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+copy+and+paste+files+on+android+tabletPDF 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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10944 bytes
SHA-256: a4b09eb3d33db90d7d47e6bc418c6497e65f8853f0c2658521dbe43675ed5ba4
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 17352 bytes
SHA-256: 67b75e99b911db150cd897c3d20be168b9c4fe5f593d628de7c0f2e7b0b759cd