Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90812e8ed99ccf0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 02:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 235b262d4b4dbdcf810592c17c5afad9 SHA-1: 2c3cdd3c6ae15799c2b375e29b9ff28d8ef68ad9 SHA-256: f90812e8ed99ccf0a5b29e8d841039d8d4b05a59731a9e179985fc6d27792d12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these are used for link farming or phishing. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://actionsporting.com/userfiles/files/87280644936.pdf In PDF document text
    • http://dribblebar.pl/userfiles/file/figimevazafofegokibenu.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/lowatositilobimozomu.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/wusumisenefod.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/43280280217.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75a39e4a3---wenaxukufojodozo.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/5542483919.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/79486841511.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/25280292545.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/buwapowokavo.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/39606990607.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rosidufawizami.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/68505831319.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/68350730874.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/7983819744.pdfIn PDF document text
    • http://freewest.at/ripikoxotowukemitasaru.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/93392513627.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kusudemabasuwipareve.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901175159679953.pdfIn PDF document text
    • http://immopolignano.lu/images/kawaworul.pdfIn PDF document text
    • https://aildf.in/userfiles/file/jutunaxuzabarekom.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/39625697638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hp+mid+end+terbaik+2021PDF 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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 18072 bytes
SHA-256: 30c715b3771d77b01c0a32eeeb20f32221b48cc832128e194277e8d0ea176da5
font_02_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 10736 bytes
SHA-256: 3eea2f1699578790e260a80335dd30d9d157c686543348a082a6a02232b15e0e

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