Malicious PDF — malware analysis report

Static analysis result for SHA-256 8199bc1a6bc59e43…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 00:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e95ebbc62beb260dd1c48ee1723e6ba SHA-1: f4415248cb1ce13dacd016bceee3f999706f7915 SHA-256: 8199bc1a6bc59e435f50e8d33eb84635f0c9834eb96177a7ff795967a12123c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'disposable link farm' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=how+long+does+rotisserie+chicken+last+in+the+freezer PDF link annotation
    • http://loscogliodifavignana.it/userfiles/files/vekuraduv.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/19275806851.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/55293496539.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210919_9A12F379F9ACD611.pdfIn PDF document text
    • https://drlanda.hu/user/file/zowefixu.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/vigijodapudukuzogu.pdfIn PDF document text
    • http://vucert.vn/uploads/files/99636900728.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/nefopoloroxedevejevaj.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/kosadusuwogawukojet.pdfIn PDF document text
    • https://cncunse.com/d/files/sufuzigarajururolulojofu.pdfIn PDF document text
    • http://esistore.de/userfiles/file/64626245372.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/josoxuburivizaraxugun.pdfIn PDF document text
    • http://sieuthibds.net/images/files/16719179499.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/gupikimusod.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4567c1cd---18151649199.pdfIn PDF document text
    • https://2winit.com/Files/files/554778092.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/bevisenul.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/wafamozewabegu.pdfIn PDF document text
    • http://goldmustang.ru/files/files/58116387189.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/5792261927.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/somijof.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f28c6dc09---mudeketeruxa.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/wozamiwejikow.pdfIn PDF document text
    • 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_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 10984 bytes
SHA-256: fdbb9eae9bdc464e97468ce4e3a3c05686191c51a64d67bdf69981d7eaf3dfe2
font_02_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 18720 bytes
SHA-256: e1582e8f4bb332afa8769713845b52e7c6acc029e9161d5aa19d51d5632cc999

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