Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b8c3729e2c26d5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 02:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f36f820522f5cc81237f4ee5dead8891 SHA-1: 59499178ccf347c88a8ddbf020b9a9b37c97b25a SHA-256: 56b8c3729e2c26d50b3f3830512e8c666b979477da5a3307f3d74645d3ebda9c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or redirection attempt. The 'SE_QR_LURE' heuristic indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://yildizteknikelektrik.net/resimler/files/57654343665.pdf In PDF document text
    • http://saluteebenesseresas.it/userfiles/files/84706931693.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/54208203625.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/purasorojiwuxozesitaseveg.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/12563309894.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/dafinolawatigamebexa.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/dawesejusarovunigedesa.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/86019183774.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/71430245389.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/71376809422.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/40446192673.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/zekaxaxixowononozimad.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/laxilajasebadaxemu.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/78513385408.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/zijonimidurumeneg.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136176d4c8bd---16462141247.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84862696508.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/kopojuniraloduloju.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/71748911421.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/birukobotuzapi.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/bovelo.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-01/images/files/55835398300.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/sufogatodawuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+scan+a+qr+code+on+iphone+8PDF 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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 10996 bytes
SHA-256: c9d20f4b1463e82aac2db73d5fd796e0175d832b8e22ccf1081a525305f0e1a9
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 18208 bytes
SHA-256: 7e360699a7e4dcd9e91e1e25fde41267ce8b64292f68d9b9fef61daeb210b6b2
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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