Malicious PDF — malware analysis report

Static analysis result for SHA-256 0939e1e946e47ec8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 03:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0015008c230b451fa858a1e8ebf22ae SHA-1: 31fd4c1566a6908a7f03eb83513bb086f82f773b SHA-256: 0939e1e946e47ec8e36ef5f9d19d6864fb75add5493274b3e2ff5575a08efba1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and a potential attempt to obscure the final destination, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://lapawan15.com/shop/fck_file/file/pebufowudevulus.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2763807353645205c6e70939170d4f63/rurofulure.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/15077040207.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/140634316159.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/givolox.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/86983950456.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/73393600108.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/68655248980.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/rubujepuremekafeko.pdfIn PDF document text
    • http://na3.it/misc/file/57577128445.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/8404411083.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/zusosiw.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/bopozazakurawonilito.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/70348072747.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/bofubefuzuwonepuga.pdfIn PDF document text
    • https://cian.hr/userfiles/file/kobapimen.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/atl09h52olpficcvb6l6vgmu21/kuxanaruremurunujiwi.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/21088749476.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/jomefegoxesofukexu.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109222329228139.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/69548357461.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/30562086208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=resume+email+body+textPDF 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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 18320 bytes
SHA-256: 7529430cd5c5ac2d7031b34eae4ef7fe3d84cf344f0e6a4eddba0cf0802ad939
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 10708 bytes
SHA-256: ba4fb8346fff65bbec67497a9871fe017cfb673cf58223d88136e5d0315be94c
font_02_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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