Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50400b416cbb937…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 01:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8c774acc041680d5a19640135e6413e SHA-1: 1c6ea7227f4c03e02898174694aef2cf494c79f7 SHA-256: b50400b416cbb937417e35d5d505e6f2e868c2c189a77fa19726251ab57ed505
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm with many distinct hosts and a redirector suggests an attempt to obscure the final malicious destination.

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 http://architettorobertafasola.eu/userfiles/files/29535614852.pdf In PDF document text
    • http://studiomuraca.eu/userfiles/files/jonuko.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/32179277849.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/69713435362.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/18501078682.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/61507809284.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/duzusewezikukevodowa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146c9f911df4---fumubon.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25bb261d5---wunudirabalimelusagozuro.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-17/images/files/75525037410.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/61639286805.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/nupigukututibuvefitubewo.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/ligamewunuwimerabodi.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/26450475113.pdfIn PDF document text
    • https://ip-pharma.net/data/files/dexogulozedezurojixiza.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/67591204320.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/82679560849.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/27312030044.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/vetoramidenevojes.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/divum.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/juguni.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/xinurezovaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=punctuation+worksheets+with+answers+pdfPDF 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_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 17400 bytes
SHA-256: 726e1434c1086e1a27d2d0e277bfdfccaae3fb91c29a6cda981d03fdb6663ec8
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 10948 bytes
SHA-256: 7bc13b34ddcc4bb75704eee34899f1b14c33dde2db1e82cae9a0145f8134b959

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