Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f0af971da1d7bf…

MALICIOUS

PDF

89.0 KB Created: 2021-09-18 20:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc52497d388531b5b70ac11595b527b1 SHA-1: 08cb601be67a1a17868d51261e9bc3831c40d2a1 SHA-256: 49f0af971da1d7bf3cd6b1c050d2d1aa559864b7b98221321966bdc39872c5ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, indicative of a link farm designed to obscure the true malicious destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, further supported by ClamAV detection. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://luisacortesearchitetto.it/userfiles/files/fimufumidexok.pdf In PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/97010242870.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/92838580176.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/tibibirukesiwidoxibamirog.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/3575323978.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210916_093517.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/jixekufo.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/91026996658.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/21857805269.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/xiligizovivil.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1eb6a9942---99711315850.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/tisigoxezasazisisapur.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/43641347176.pdfIn PDF document text
    • http://ausafe.net/images/art/files/pepagarodinazisinom.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/10547969966.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gfv8q8jk3b2v0k8jnrffp85f40/49964669399.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/79419688044.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/94259634818.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/44469006430.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/62816228912.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/gizarajavup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=online+vce+to+pdfPDF 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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 18548 bytes
SHA-256: e69d01c48ea1649fbd751d4b6263e4d7dcf41f709aea5e7453cce723d81b683e
font_01_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 10276 bytes
SHA-256: a8c985e8a8f5eb7fe38913b2fc3df543eb47687f6e35c6ba5164323c31bbcd89
font_02_sfnt_off00013e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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