Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c324c090f52045…

MALICIOUS

PDF

89.1 KB Created: 2021-09-22 10:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e79edcd142811ef55e37afd4149c1eb3 SHA-1: bfd392de931f64fc8beaa8574e8330da20441fe3 SHA-256: 80c324c090f520455f5d273b37b63d1ae2ff8acd70a53c69e73da127674e6260
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on potentially untrusted hosting to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/56647136282.pdf In PDF document text
    • https://olterus.org/contents/files/4396254330.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/69634462742.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/96369291791.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/bepatodefofifitevo.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/kijinimokomalomiwa.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/66434837401.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/23754794235.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/24695965700.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/fimuzenu.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sibaduduxore.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498076838d5---52949073324.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/17776559582.pdfIn PDF document text
    • http://pasaru.com/upload/files/toguzo.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/rovazevodijidumib.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/rujazopo.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/1685126883.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/57801027243.pdfIn PDF document text
    • https://datawire.gr/files/files/20413554085.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/88900158921.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/59709911645.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/gu5sk4g2k1ft40g1paat4i5d36/99212000675.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/52498481795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=google+account+bypass+toolPDF 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_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 10752 bytes
SHA-256: 641761836fd2f69fad0be1b17bac47c1181faf16b58c6cba1a6179720314be09
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 17484 bytes
SHA-256: 9730980ff3ae591ef4e7a6a4486241f2ccf0b8ae9d9f1b5d026f0b3d14c58da6

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