Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2e88b97a53b1e0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 12:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4557ac051d235da08cb959358ee2e590 SHA-1: 8e5dfc5924ec8d0eea5cc30f74552050d924af77 SHA-256: ce2e88b97a53b1e023df9a511ab428fbe1d967916347db78aa2c231971739ee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure malicious destinations. While no scripts were extracted, the presence of numerous unknown URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hinodanang.com/uploads/image/files/ramorikikogesuxinebibur.pdf In PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/15973348437.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/17052152711.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/lapesaj.pdfIn PDF document text
    • http://chinahongji.com/d/files/nadejiwegid.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/12842700166.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/6433928401.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/58966796023.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/xatoxajivaxin.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/ruzokasupukis.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/36594941905.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/daranumaserog.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021921151224775.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/lofofibovagizarepo.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/57698782221.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/lebuku.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/91487591612.pdfIn PDF document text
    • https://expomediainc.com/upload/file/xopadototamawujofegum.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910200649.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/zonafanojob.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/vumupixedukamafenul.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343b1b1a27b---83184284442.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-12/20210912000314911485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mi+note+7+custom+romPDF 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_off0000b765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 10328 bytes
SHA-256: be3dc796735230ea70b4fcc4dbfdc2cc70296b1c72990eb9b16d6dbc9ba19b47
font_02_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17124 bytes
SHA-256: c2ffadda0097e9cdb4ca59e26f529ac4a32590c4b4b863b1db13ed2b87e077fd