Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b8d74c5dab99c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 15:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e67b7b6df1eb1d7ee89767e1bb96742 SHA-1: 5fe48907b9ced3850c11ed7a92b07dfbe5b46354 SHA-256: 8c4b8d74c5dab99cf67f90271e19ee14684221c37cb7aab4063d2aed9df7d035
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for distributing phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://probeg2000.ru/files/userfiles/files/34373755521.pdf In PDF document text
    • http://perfect-aerosol.eu/userfiles/file/madasegisumazimipopinud.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/46276072227.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/53959780782.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/5519492304.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/bosipanidapewiva.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/mefala.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nuvukuwiwigomedevazul.pdfIn PDF document text
    • http://prestopc.it/upload/file/17466614109.pdfIn PDF document text
    • http://canadanur.com/resimler/files/22560221716.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/vonewarasipelaxokuta.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/70028837825.pdfIn PDF document text
    • http://ministerium.pt/files/kurivowavux.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/xirasufizakonajimumuduk.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wazidimoregovikomuli.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/kewagilirawejod.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///59721514593.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f04692777---86431415445.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/26029430897.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161307c02d50e7---noxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=virtual+space+root+apkPDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 21772 bytes
SHA-256: 02b27413dafb3f0e8af53022bb0b63abae9527e24f583980781a7f5054458996
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 10424 bytes
SHA-256: 93f856d1032080ed49178abc7265ca0e51f073ac576c77f25929ea17dbf0398d
font_02_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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