Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5cc7b07551a299…

MALICIOUS

PDF

75.1 KB Created: 2021-10-01 05:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf8418e9e7483a4ea5e0bfc291e422bd SHA-1: c6263258c96fe1dfb80575dc77d7596abe180306 SHA-256: 8c5cc7b07551a299cd2db4c1b33be2a8648744ee39f3feb7b8e45b41914e1419
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing operation. The PDF structure and heuristic firings indicate it is designed to redirect users to external content, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pc-driver.ru/userfiles/files/luvaluburo.pdf In PDF document text
    • http://vetsnab32.ru/userfiles/file/80381923529.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/mafowemukurokofozod.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf4add9263---xufarobodemivenozipeju.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021922165514.pdfIn PDF document text
    • https://ms2oke.com/contents/files/ketevopugufawotaxeb.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/23492021947.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/49338718730.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/34888895109.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/14230175227.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/fuvajurezugepexulipu.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/75422747135.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/mokarizil.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/14633170403.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/15956977626.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/614cfa2633c9ca6d9ef2e151efc7bc9c/vigixajatofisubuvavure.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nurifip.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101624147091.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/desixamawapowogikox.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/leviti.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/52841091813.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/karovafotav.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/tesabu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wuviwabedefobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+can+i+transfer+data+from+my+phone+to+another+phonePDF 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_off0000bd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 18500 bytes
SHA-256: b046f69034bc2e6f991caffabac6cbcf357ea23437dac530776900857c4b9240
font_02_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 11028 bytes
SHA-256: be569fd3b2e20a2d4e502ef30fa73829f0ae338f4d300ca15f5a8e308f892953

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