Malicious PDF — malware analysis report

Static analysis result for SHA-256 1231d7d206921f71…

MALICIOUS

PDF

70.7 KB Created: 2021-10-13 00:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e43b04240b99fe05ccaa7345fbe32f7 SHA-1: d2820e3249afce405f758c3a5d9379e7c6385990 SHA-256: 1231d7d206921f711ad861e408459511d6de7de3709d30659cae4cadd02ab5cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document's primary purpose is to host numerous links to potentially malicious or phishing sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving user interaction with external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mkontroll.hu/File/14442341613.pdf In PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/69189115057.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/89160559851.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/gedixemafivip.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lawerozafipodifi.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/kunezoxifen.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/68562041697.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/nisazerogozexut.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/tafide.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/wesofob.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/22331814838.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/zuzotepatotopepimojowe.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/25428454447.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/wolejodubigoxatox.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/69079744483.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202110050934386236.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bc29daad---22019719397.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/punana.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/3059224316.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6357162608.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/23610032591.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/77468239192.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/49761482873.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=chi+square+test+hypothesisPDF 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_off0000b5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 10588 bytes
SHA-256: fb6ec45af1b62861215dacaff5f1147faad835e98da5ba3a0e8640bb8ecfdb93
font_02_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 15312 bytes
SHA-256: a268d56a42d7c843c57ad7cfa45b7a82e7c37d8856b09ad8861e0c13a6a4acb6

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