Malicious PDF — malware analysis report

Static analysis result for SHA-256 d973e8878dd73077…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 20:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60ec2f0d5a21d51a9ba2bc7559eb3b04 SHA-1: 924fdbb6bf886003bce03e7cc44bf952baff9b19 SHA-256: d973e8878dd73077ca32373000b44e5a9c5f930c04ede30df597ae082414fae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to obfuscate the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://metafelix.it/userfiles/files/12861924778.pdf In PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/pidimemevezabinezigo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/lipumivusitizaduw.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/midesijo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/livikisozabijutizivanoti.pdfIn PDF document text
    • http://flexa.cz/docs/file/2137595635.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/xirojatoge.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/50965422494.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/81468994284.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109030002483857.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/sarekiwixami.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/98265112871.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/26318419479.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/vatelefezanaxadazisibot.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/89299782945.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/42678934331.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eacb5be4e---xofobuxu.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-21/images/files/73188388313.pdfIn PDF document text
    • http://flomojapan.com/upload/files/fijixemetejitirusozif.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/14081061371.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/judefutezavado.pdfIn PDF document text
    • https://cartolmania.it/file/mesivabarazosolegov.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/46231120012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=india+official+languagePDF 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_off0000aef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 16812 bytes
SHA-256: d3e3e16c2812f9d6543f2620efe1296ff6b5743b34f2f043b6d3d855ddb9c1ec
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10336 bytes
SHA-256: d4f699802a7a54d6e92fd31a7d5115998dab798cc658fbc065d65db482ab45ad

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