Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f5495281234837…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 09:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0cacef42c06c70f2cbc02d5c616c548 SHA-1: b0ee6412693257bc6b8239e1b62b2ead2a7ca532 SHA-256: 18f54952812348378e0e7c0e65325670d956ed57c02516cb81856a86bbaea4c0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of many links, including one with 'utm_term=live+email+sign+in+page', indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bassbasement.org/userfiles/file/ligamupaworepodobutix.pdf In PDF document text
    • http://dmkert.hu/files/file/49674834945.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nuwuzoregu.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/15243836480.pdfIn PDF document text
    • http://heizler.hu/files/file/nokovugivuxidod.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/zufiwap.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/43846952159.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/ferigepa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aefd48f95---ludegavi.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/niliduvebevipotutovu.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/13747848600.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/xukamareku.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/vexosobagesis.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/ratokotixoroti.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/tijokejelivipikada.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/jezogagavunula.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/64296681609.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/zezujagorivegip.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/96369797778.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/6348018713.pdfIn PDF document text
    • http://labradory.pl/file/34106385215.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/lububejuzuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=live+email+sign+in+pagePDF 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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 17404 bytes
SHA-256: 458263e91c78a6dd5a6cb51f951e90aa6125726b3226a6645192b4bad936583d
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10300 bytes
SHA-256: 09bcb08d68dbc7f91a7aca88f565852cf3c3a15486809dc4f7d9c96583c12ad5

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