Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda36bca5cfebdc1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 00:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ca36bc8e4537690f9b4aca82f5b9a5a SHA-1: afdd3b1bb7e5f9dfc1a909574f40aab40cac5da7 SHA-256: eda36bca5cfebdc1b6958253ee8166203400b2f27fde6d7ed1a503572284ea42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=warner+bros+snyder+cut PDF link annotation
    • http://ylphs.com/ckfinder/userfiles/files/fofos.pdfIn PDF document text
    • http://zgic.ru/!upload/files/61946436459.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497c3578265---wimaxog.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/3500347348.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/31184268447.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/mixijafasal.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/92836777781.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/79981519036.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/tazosovonu.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/52781921360.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/lefazogusezigudat.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/26406933413.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/29585757123.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_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 17420 bytes
SHA-256: ea36ee54a7e5684da85614c5430d33fa2803185dac55cbd131d474d95d3148cf
font_01_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 10572 bytes
SHA-256: 95a9e4c25db3de8373207422e28ea1067954755f778ee891f01be1ad4ded2558
font_02_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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