Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f13259d078c857…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 10:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01e0f02f53b818d863d731353304d0e9 SHA-1: a70a591e4a0256f7102a73e8cb0a59e7100c78d0 SHA-256: 55f13259d078c8576c88a7c3180f0690f0276c1efe866419df4270396a2c52a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and are part of link farms, suggesting a phishing or scam campaign. The file's structure and the presence of external URIs indicate it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=harry+potter+and+the+prisoner+of+azkaban+full+movie+online PDF link annotation
    • https://okazdedziecko.pl/_files/Media/file/tugavodivexewalo.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a811288ec1---domovodufabebafasovixa.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090808334373499.pdfIn PDF document text
    • https://fratellifurloni.it/file/67114458111.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/41395211868.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/togipuzikuzo.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/fosep.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafijuxi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bp568koihk1e9rnbscla313rc3/5581909696.pdfIn PDF document text
    • https://songhong.info/userfiles/file/famatufemipusafonuvi.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/43525068016.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/jowoxigumap.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/9420182341.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/kutibexusatizigov.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/39706493237.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/bujotepixefasex.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/441341356.pdfIn PDF document text
    • http://prestopc.it/upload/file/20452468667.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/nizonibipusiguzawik.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/juzasibatezabafefokolixe.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fafariduxalosujiwoxula.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/tebivakajumuzedikopodasal.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/7532554073.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_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 15912 bytes
SHA-256: b6f0644a5fb6490a06125b1489a1e3266a76c6299fe64ddd06d65dd438265f36
font_02_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 11324 bytes
SHA-256: 12b95ad6c3730fe805f3f7c82be4795ac30b21ce2849f311b6d2af88e54aa1fa