Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7c2763fc66ac19…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 15:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 2b97a8bf7e7d26353e3c8095eea9e0d5 SHA-1: b000dd1e826401d0719e5fe73b8f5f7410cd72e9 SHA-256: 4f7c2763fc66ac193dcd48a2931f5d91cf4b4c3f96dc5605342e48274920cdb7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ventadeterrenosurbanos.com/userfiles/file/30081922965.pdf In PDF document text
    • http://hooleihomes.com/cms_images/file/lenul.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/47137665050.pdfIn PDF document text
    • http://msiutilities.biz/documents/gumusi.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/tapag.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/polojin.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/nuzolesig.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/vumumulefisinan.pdfIn PDF document text
    • https://shunnasato.com/35180354992.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/52250738152.pdfIn PDF document text
    • http://ty-int.com/files/files/41089261268.pdfIn PDF document text
    • http://lawngo.net/fckfiles/40630095265.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xelufubida.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kugiza.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/2925279192.pdfIn PDF document text
    • http://nprofit.hk/userfiles/64804788164.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/27477595954.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vusixifamu.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/44377385812.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/88774136436.pdfIn PDF document text
    • http://panova-art.com/files/file/pigerowekerupipobojujar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+send+photos+from+bluetooth+in+iphonePDF 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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 18260 bytes
SHA-256: 4d989f638a2e910700337a49d5f2ef6c30ccaba49966312487997c9b69ca7b17
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10916 bytes
SHA-256: c1122791ac5de22177d42faf73910f183751e55545d48954c52aa5a0484e7be9
font_02_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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