Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd876f0de186a471…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 15:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 73df74f48f8b0a749ad11a41e2f2c11a SHA-1: 3d7eb4c664e4a5ecd3a37f95da669ae65aed89f1 SHA-256: fd876f0de186a47156d5e095aa06971ad55f326c758c549e1670f3e73c3a6532
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to malicious sites. The embedded URLs, despite some being marked benign, point towards a strategy of directing users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.tiande-global.com/ckfinder/userfiles/files/mejarilujexobinalanizame.pdf In PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/36175395750.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/38592971950.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/8839808020.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df26ed4922---dubazisititeji.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/xutibiturufixivuvexu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/56707352130.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210910110612.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/93af42f2162f76c6fc410026319b8353/20074621597.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/mesunoxijurifebabivudej.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/35421534579.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/75538083160.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/ropizinuxijifozawox.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dumilukev.pdfIn PDF document text
    • https://thepainter.asia/upload/files/25927678953.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/kexavuwofakaxegubiniju.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/10495391471.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/95563633571.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/sijaru.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/363380883.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/2443133892.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xutesadivediwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cazadores+de+sombras+6+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_off0000c0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E3 18000 bytes
SHA-256: c5ee4ede113445ddef3ade4cc3a3b0bbc3d1da8b1c1b93623a7d695bbf683ea8
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10716 bytes
SHA-256: 2d726bad9cc4490b844ee64332069d59d6d7153e26d30560a1f2a90c7ab6b125