Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8773d3f776c0917…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 08:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 159179e7937484191e72adbaab6cc8cd SHA-1: ede5fb14b60e2fc78c18161b1907913e16a6c12b SHA-256: e8773d3f776c0917c342d72c59ebe3c924e178e5811ede06c0eebab81ec6edd8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.kevimotor-rock.hu/files/files/43378039097.pdf In PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/86165558116.pdfIn PDF document text
    • http://gibisch.com/files/files/43060244749.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/13411329856.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/35245220641.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zaguxipeziwasozufavi.pdfIn PDF document text
    • http://chromoink.com/updates/file/benuvukij.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/94783475049.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/49896271363.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/feposexilewini.pdfIn PDF document text
    • http://status.cz/UserFiles/File/48539168132.pdfIn PDF document text
    • http://cwesp.biz/upload/file/vosipipaxovekinefeden.pdfIn PDF document text
    • http://koala-al.com/d/files/57654293608.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/53604678884.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109082153293716.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/davozafexurumekominuzino.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/nejet.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137396ac2484---95700654452.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/neronopomogetubebef.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/86576084233.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109190903426434.pdfIn PDF document text
    • http://besteva.com/upload/files/39110827644.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/dofutafef.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/nukufurezaxokesolus.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/92018113571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=apk+gamers+gta+5PDF 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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 15500 bytes
SHA-256: 5cebd9c542cfedbfe3826a2dd42e25123db9b895e73db48dfbd216e453277c10
font_01_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 10440 bytes
SHA-256: 4cb2386ef2a441f4f2e3b39d349b185e940bff075a0e6a28389f45d169b0caaf

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