Malicious PDF — malware analysis report

Static analysis result for SHA-256 4471f9208986a55a…

MALICIOUS

PDF

92.9 KB Created: 2021-09-21 05:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 922304330295322ed78da39d85bc5891 SHA-1: abe6301178973d1d72569d51bbc10259c0a66323 SHA-256: 4471f9208986a55a2273ee59ecf10ab01b91531f6bf2ec89f2bc5c7a6fae5344
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bravo-hk.com/userfiles/file/gakejovewinebubum.pdf In PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918154903741164.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/22494641478.pdfIn PDF document text
    • http://abc-tel.ru/data/File/68163797543.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/97301897073.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/76619545072.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d75b5cf2511f15e4dbf3996cdf4839e8/tutibememowamoxuferape.pdfIn PDF document text
    • http://www.heksan.com.pl/file/figokefokufirumedom.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/dupoteveregu.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/duxojeveseva.pdfIn PDF document text
    • http://sivam.pl/files/file/ruxixevozebupirifivina.pdfIn PDF document text
    • http://skene.es/userfiles/file/92018712617.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/wixuxigesetavaz.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/wafanal.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee1f5edfd---36253222561.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/nesubalidu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/24457548385.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/94431577342.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210917090551.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613791e873d02---tekamememazuxiliragakil.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gativajowisuwisak.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/namuxives.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/maginoborogaxiwixerobajap.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/9469452864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=who+make+android+softwarePDF 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_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 10744 bytes
SHA-256: 9885bf60bc12d33a2cee86b261f7a7ffe95683f61f8230a51870bf22d9320e01
font_01_sfnt_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 16892 bytes
SHA-256: 277e9c32d93f104123c99b1f5f547a390730f9f409520ba9dbf321fe06d78ebd
font_02_sfnt_off00014d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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