Malicious PDF — malware analysis report

Static analysis result for SHA-256 c809b353306eee23…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 01:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 720c8dd3c06c6143e122ae3febe889a9 SHA-1: 7a1999b15a61f9b7fa4f0425a238841c97e28d56 SHA-256: c809b353306eee23383a0ce632b9d1a4c60f7526c78ce66afc90b3e81b6a2308
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to disposable domains, indicating a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chasehr.in/userfiles/file/tifegixez.pdf In PDF document text
    • http://alocainghien.com/uploads/userfiles/file/87371918085.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/34164590366.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/5596305892.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/vaguzexupotofod.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/kibatozitudiraxepe.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/26774925013.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/96ku1d7isujgqv0150h8k3qcis/nofovedoba.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/kufefudofebigeminubu.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/74482190036.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/diwuwakovivefexa.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/xafegav.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/27349410120.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907232430738.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/zozuzaweloxupevosogup.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bizirobemu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/puxadababo.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/10818772274.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/55659455106.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/kiluxinamibili.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613178dd397c9---28648370349.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/3414291104.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/zonidavidomeduxadat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mock+location+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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 10052 bytes
SHA-256: 6e359839948e1cbc35f4336dadefef12583058d3fce72d1442bea60ce4fba447
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 21400 bytes
SHA-256: 2865aa127a38a34e3debdc48e84482241b75ddb3d819308f9ea18e983f0690b5
font_02_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.