Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39bbcda0e982a8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 15:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6723a6e15d1189300694f8400212765 SHA-1: 62947a787fb1b1ce35e339a6fb24657cfca54b12 SHA-256: da39bbcda0e982a8236f739ccdf1d6d2c1b30a60bf5d10905b696b40b086c3b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tulga.ru/editor/files/88633782795.pdf In PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/75037152703.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zipuduluzitenezef.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/mozawowusepegivalu.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/87131901522.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613c03b21ba30.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/9634165258.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/36673667526.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/tulafigakerotiropasidokon.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/livorim.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xozelefirun.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210908035159.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746fd33ff8---10102626179.pdfIn PDF document text
    • https://badoza.net/userfiles/file/pavewufu.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/wejasani.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/81567358252.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/78599902036.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/16353917395.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/bogavunexi.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/luroliwegosunukigiza.pdfIn PDF document text
    • http://philboyd.com/96228266312.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/gobavugewade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=spartan+poker+apk+free+downloadPDF 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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 10484 bytes
SHA-256: b959e1910ce96a48e9b18c21c8b933f0d090aef9080b830a433caaed09e47189
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 18736 bytes
SHA-256: 681d3dd6b9ecfd8300634624d1b793b7f9e768fd29ec9a72282df9fe95f96eac
font_02_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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