Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8178169fcfb22e…

MALICIOUS

PDF

72.4 KB Created: 2021-10-16 12:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e03e213d3997ab5f0e79f62fdf384fb SHA-1: 5b1df7eec5bfc7f3e626a7dd7e691ac437569659 SHA-256: 2a8178169fcfb22e9eec515c3957af9dad0a1c531e8b1be5d9f9871973576b9c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically flagged as a phishing trojan. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggests an attempt to host malicious content or redirect users. The heuristic for urgency lures further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gcsiva.com/files/userfiles/file/61229886254.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/95776439023.pdfIn PDF document text
    • http://jonme.net/ckupload/files/lotixajuguponajezu.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/mobutexopu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/finepokobigirixojit.pdfIn PDF document text
    • http://limoride.net/gallery/file/gisudoxuxesome.pdfIn PDF document text
    • http://iknow.pl/files/file/32432689356.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/288281421.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161591a2dc4ac1---vavajoveresutukarivo.pdfIn PDF document text
    • http://rvhifi.cz/files/file/13881448612.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/manopaf.pdfIn PDF document text
    • https://netlandschool.cl/files/buroziruvesevasezaxorup.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/wirub.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/32968044837.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/kudifada.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/33679820952.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/61093598990.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32816598086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=ecology+essay+questions+and+answersPDF 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_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 10972 bytes
SHA-256: 497bcf41da83c86f1ee2c774430f5ebf276fa97ee2af4f57ce7f4b2726166ae5
font_02_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16712 bytes
SHA-256: 5f82e8efda87f0e8e91047ec20c168bf42971f30ac3f5c5538b57598cd021641

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