Malicious PDF — malware analysis report

Static analysis result for SHA-256 83063dac0e03a377…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 10:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52f7e2556c0dbb2cd724b80109bf0ab5 SHA-1: 819caa2ead6df41877d62a72f8b7172a62b35e7e SHA-256: 83063dac0e03a377be7d71395a4b28a0fb9da433f90639b2fcf2c475b7304ae2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://fkjz.cn/upload/files/2021/09/202109121934043996.pdf In PDF document text
    • https://pleasanton.com/wysiwygfiles/file/16015943.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/43148980116.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/suwozubururikite.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/60301705036.pdfIn PDF document text
    • https://clubon.top/uploads/files/xaxizizuromor.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/70941919790.pdfIn PDF document text
    • http://drtamerturan.com/file/67472303686.pdfIn PDF document text
    • http://esistore.be/userfiles/file/72423820070.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/53753011608.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u69d0ajqsd81ovfp7pr3u6ccq3/47797714015.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109111600541642.pdfIn PDF document text
    • http://terrietanaka.com/library/files/duses.pdfIn PDF document text
    • http://ministerium.pt/files/fudejupa.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/pafulofosizuno.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/42530277353.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/zoxoragezujazusuluwir.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/42528404871.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/janaledubabe.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/55616778410.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/40528931354.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/sutasesasuv.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/54191411476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=armada+vpn+free+downloadPDF 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_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 18148 bytes
SHA-256: 12962ffc1fcdb98efbd57abdc23159f7de8ff352856e9a439869298001b0ffa3
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 10432 bytes
SHA-256: c3e3d112d9b13f1c3cc836f9fb0877983e6d18600e194b82caf2024ce01f399d

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