Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e15b31591f9347c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 09:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77b053a3abed3f1883f4ecbfb07be4ad SHA-1: 26b249d3e95ec69810bd1dbc372af0a0e30d3557 SHA-256: 2e15b31591f9347c6a25e5124de053e925301ed397dc6efa1a130d78c2014ab7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=english+to+persian+dictionary+pdf PDF link annotation
    • http://sun-apartments.pl/data/pages/tuginemikozun.pdfIn PDF document text
    • http://inercial.es/uploads/files/43031195936.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kegeli.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tugibofomiwefixumarowaki.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/gidilifipof.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fuwijonapotekuxolupi.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/59428568306.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/gigeximazotawun.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/35157059805.pdfIn PDF document text
    • https://istanajp.net/contents/files/xadenigonirozujejogi.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/berazexovowinafe.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/63529785162.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/vevisawegilasefamiz.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/89536246179.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/77684814752.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/81344956672.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424088a4b57---varagebulapesu.pdfIn PDF document text
    • http://bankerz.in/qpic/files/18441484872.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/ropis.pdfIn PDF document text
    • http://jsdarvin.com/files/15210019888.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/82607495654.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef59079e2a---76216244292.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/63272332018.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 10996 bytes
SHA-256: 97e6c422d645d00e48f4f94e5e3f22cd3b403dacc318a84f2b553e88554cc9ee
font_02_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 18616 bytes
SHA-256: ba7d606cf44d08670714c3224df418169f99ec851e3f9e3155faa59053407315

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