Malicious PDF — malware analysis report

Static analysis result for SHA-256 74689190592b06d4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 00:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c590bce3cd6a3843e983d5496e041ef SHA-1: 4fba3eebe833d813354aec75e45ba33db144a85e SHA-256: 74689190592b06d45dda97f68568640991a367c585481f8cde21044faeab748f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF's purpose is to redirect users to external, potentially malicious sites.

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 http://itps-group.com/uploadfiles/file/27547157823.pdf In PDF document text
    • https://mebelihome.ru/upload_picture/digimimoto.pdfIn PDF document text
    • http://logicamail.it/draft/media/guvamijobapevanasepod.pdfIn PDF document text
    • https://geniodelweb.com/file/domijaguzi.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/sobevedoruza.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/diwozesasezikemazif.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/bogejenuzedelokovix.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/47522ea20c69492a4bea674af5339fb7/xituliro.pdfIn PDF document text
    • http://teakdeck.pl/files/file/3641530284.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/dibakagamodogipa.pdfIn PDF document text
    • http://birdwatching.sk/media/file/57695127668.pdfIn PDF document text
    • http://17njl.com/userfiles/files/20691760807.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/68954060811.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/peput.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/napixesojagij.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/luvoguwibokam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138161e58850---gufazokisujetapejigono.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/bavibosuxowotakuz.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/47264812349.pdfIn PDF document text
    • https://brukspec.pl/upload/file/rudupuwolibojo.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913025331372.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/7479395302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=4g+force+lte+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_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 10364 bytes
SHA-256: 43f189ab35fa56db99b88b95e4ce07de5d3c90536cd9b500cea01cacb3be5227
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 17856 bytes
SHA-256: 6398a44950c3895c27d9cb27ed37881b7ca04c7ea51c93d15651da1a36f70a37
font_02_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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