Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fde8f1b6e5965a2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 11:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 15bc6e96fc1f437848ef3fc375f13702 SHA-1: 47e677444d2754e8b8b1872e677844e263f67591 SHA-256: 1fde8f1b6e5965a2b28e913fa713fb99ff094adca873be97f927eda223eb338d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The sample is a PDF document flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious phishing content. The 'SE_MFA_LURE' heuristic specifically indicates the document is designed to harvest credentials or session tokens by mimicking a multi-factor authentication prompt. Numerous external URLs are embedded, likely serving as landing pages for the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://nomylo.ru/uplcv?utm_term=google+calendar+on+android+wear PDF link annotation
    • https://gyn-koe70.de/obrazky/file/3041658534.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/8133663949.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/78865162521.pdfIn PDF document text
    • http://planbmedia.hu/files/80061750308.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161350952efac4---tuparipap.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/luzibujojimi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/97ef394e3e66da38acd00bcf849966ee/75824561538.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/49976015552.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/xujoroporapivaseta.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/fipimisofuzepavum.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/fuwilinuluduwevotab.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/67639005740.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/kisozuz.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/58947808161.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210906_010452.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/51447854834.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/29007642265.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/18228181272.pdfIn PDF document text
    • http://sjanzee.nl/file/zasugiwupamuladarajutagi.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/13105209334.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/11791984507.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/48092630440.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://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_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 10404 bytes
SHA-256: f9f55ce8ea56af8de0d9da40e1f9c9516390675ac6cf3ceb18524865ab3a6919
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 17856 bytes
SHA-256: d883610c0e13d1ae042cebd2f58d866faf4c030cd1ccdcd7a34fb2ff3dddf04e
font_02_sfnt_off000131c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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