Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bfffa6b12eab0e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 03:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb7d8bdd0a72268e3527a8a7ef649c61 SHA-1: 7512483f6fd4a39589c966ccd51444b483b2925b SHA-256: c6bfffa6b12eab0e849177ed5e79f35f0af598f3773a3ff9329c41f9b366c6fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links, potentially leading to further compromise.

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 https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2fd31534---muman.pdf In PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/82170075516.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/37455782831.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0814007001631752289.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/volevinolinezuwatubexir.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/welibodamo.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/texawaforavuwunonuf.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/58518411117.pdfIn PDF document text
    • http://szcftz.com/upload/24115646756.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xurisetavodu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/tegexijuluvoju.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/kififurapovi.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/vogufulukilemexewos.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/38927062799.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/dajimoniwez.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/lejazisiwuli.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/83089576538.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/59684671812.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/fagapaxogesosodudizopit.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/87874254098.pdfIn PDF document text
    • http://health-bridge.in/upload/file/wuxafaporaturipe.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/sanolarugavemol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=telegram+hack+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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 18304 bytes
SHA-256: e1c1f9fa27c97a6a8b01aeebc8156b98309539e161ca7df04751fabbb7ea14e1
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10292 bytes
SHA-256: 236d3068f1617ebcb8baf311a4295ca6be53fc60f0383c57d6a0cc2c9a2e8684
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1