Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fd465ac52f3008…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 09:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec00b823e204edb55f4506f99d3c628e SHA-1: e79aca8aaaec592c96e73026677dbcfafc07cd41 SHA-256: 28fd465ac52f30080a1e6cd4d592f116e72ef10a9dd45f86b8997013f44f5f8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=how+to+turn+off+auto+rotate+on+android PDF link annotation
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595b9c1467---73248039816.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/40976426583.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/juvowizojozaz.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/34266600960.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/pizawufepuw.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/51403290630.pdfIn PDF document text
    • http://thegioioto.store/upload/files/paxaginofi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pobelogisipepukoj.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/6390509515.pdfIn PDF document text
    • https://quizai.com/uploads/files/tanakizetomixopazoxuxilup.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/gutoxizupexudajakavob.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/57611167252.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/74664869035.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/radapodegadiruzebozesasab.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/tovazimepobikiw.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/48162063697.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318cdca0002---bitubovuxow.pdfIn PDF document text
    • http://360global.ca/userfiles/file/donofikavegivut.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/jijurow.pdfIn PDF document text
    • https://adikmanis.com/contents/files/12889733284.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/74960454875.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/fabibadigorefibizigoko.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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 10312 bytes
SHA-256: 99a37bed84363661f057c8c384e35abff13981c55e35b056f8585b583919563a
font_01_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 18844 bytes
SHA-256: f474b9589cd614c723b516739188e1284d5a614b2ec663734cbc4b96d72594c0
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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