Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f3cbc883b4f023…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 13:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e75bedd91377377f3d824b908a5e9687 SHA-1: 6fb936ecaf28ec62e348ca16a114723e4510e4bf SHA-256: c1f3cbc883b4f0234e3d2d8b83e1b2af1f48f194b22021a0228574e35be5ed0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on potentially disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=msn+messenger+para+android PDF link annotation
    • http://orsini-blasioli.it/userfiles/files/9996635041.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/89533003817.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/moduvuwovadegobaworomaduj.pdfIn PDF document text
    • https://topupdana.com/contents/files/togovugugegavuju.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37841741104.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/zamavinisat.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/963502383.pdfIn PDF document text
    • https://everestart.com/images/stories/file/47312074713.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/dabifelu.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/nizobefefoxovibuge.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kopebinalusujojes.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/mowudamexugiguve.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/tukonikaketafotopaluragug.pdfIn PDF document text
    • http://portableandcool.com/files/files/49339568286.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/vivufokewupulolamugat.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/babafimadarepese.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13e6b2946---6971581075.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210915185420.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/13056047272.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/59619760032.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/doleluxedonelobuvodalan.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d5cdc69348288f02851aee8800ab3a9/tijor.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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 18560 bytes
SHA-256: dd6c7527844f36c0b09bd9afcc99f30a337e05cb952b48cff63592c3af96a979
font_02_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 10584 bytes
SHA-256: 0cb765b1e325256d9dca6249d6ecac6a436fcfe00d07fa683e8eb72dc2f76bbd

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