Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0f68a956c993d5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 15:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 899cfb7dbc416f7154a2c5083e1c1f5c SHA-1: 18b94ae4db474c4aacc2022b9ebe5f8eb15eef74 SHA-256: 2e0f68a956c993d5dd6394864913c1a33bc055ca89057311661c4a08dd7ff836
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 are linked to link farms on disposable hosting, suggesting a phishing or scam operation. The PDF structure and embedded links point towards the use of T1566.001 (Spearphishing Attachment) as the initial access vector, with the embedded URLs serving as lures to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=man+in+the+suitcase+full+movie PDF link annotation
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/53995466745.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/gidupifesizufatefaguw.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/67316208306.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/pokimumote.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/25279414784.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/61701216591.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16999637991.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/25065527432.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/11237838260.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/51923081555.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/49856449650.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/ruwukujixesoxal.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/55895908368.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/xukelanerijezobod.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/kupipokixazevugux.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/96579635708.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/wejewuteva.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/peluvedo.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/33555485642.pdfIn PDF document text
    • https://bak.vn/upload/files/pasodikonamika.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/62446885900.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369377e3ebd---wanazakifeluwagibazowag.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_off0000b0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E0 16176 bytes
SHA-256: 6f28713ac372b9983f12ab1f8038a15fb1fd699647cc9106324abfc281b48fd4
font_01_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10660 bytes
SHA-256: 2b4d24a1ffe247cb11eeb0a61fb478525ca8aa988a885c3681481d217ff17dc4

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