Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af6cdd6ccefaaf2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 01:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 363537529e6adeb13e02a00d6a216b0f SHA-1: fc3ee44a2d26eb506638a273cc92edff87bce951 SHA-256: 4af6cdd6ccefaaf268f78db770a86c4b6965a8367cd7328eac43deab21562f60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bjhtdszdh.com/v15/Upload/file/202191335193075.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130733757e47---kenopomak.pdfIn PDF document text
    • http://ativn.com/upload/file/pifeganopume.pdfIn PDF document text
    • http://bastola.org/userfiles/file/55884696279.pdfIn PDF document text
    • https://premium-house.uz/images/file/tiwumo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bac0c8965---tijiw.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210921053248.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/suxopimamekewevesasozisel.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/92104674791.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/11434331549.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/66344994251.pdfIn PDF document text
    • https://paperland.bg/uploads/file/7476953802.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/94937663913.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/dexomodufevatubejom.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/43815934149.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/kozujijaritobu.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/jafofuke.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/6909614172.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-13/20210913081913870475.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/faronupisoxozope.pdfIn PDF document text
    • https://halkum.rs/files/wokapukubisifofi.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/numubopidagedaxuruvuver.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/sefidobizevivef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+find+hidden+settings+in+androidPDF 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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 18216 bytes
SHA-256: 0c0d8e47de3a14952c74146836826e3e27cf8e4b5a252158378f6c4d908ad63e
font_02_sfnt_off0001212f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212F 10664 bytes
SHA-256: eb3358a3180d7225dacb350af8ca84c3ba7c9489a53087bd3ed23d6097914f37

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