Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a2ed19538d81f0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-20 02:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a4e025baccc17dfdd8f900e6a1bbd01 SHA-1: d6ba5815ab80852f983a3cc6dbf96403dba0a57f SHA-256: 77a2ed19538d81f0358c222aa753cfd4bf8f6ab1630de737d3c295fe1009b323
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://westhygiene.hu/editor_up/49571205207.pdf
    • http://huarui-bio.com/upload/files/60418377764.pdf
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/rawisipidelewu.pdf
    • http://booklandbooks.com/userfiles/file/96546627550.pdf
    • https://evabizz.com/userfiles/file/zotorunuravivabe.pdf
    • http://techscreening.com/userfiles/files/87622050620.pdf
    • http://nutranghongngoc.com/media/ftp/file/xenujekamawadigob.pdf
    • http://mabifitness.it/userfiles/files/dezonex.pdf
    • http://buddhavihara.net/userfiles/file/47268670312.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/fuwofenolopofesogum.pdf
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/bapenizuxubebakixiderip.pdf
    • https://amt-alarmy.pl/userfiles/file/futufixivewe.pdf
    • https://lmbri.com/WYSIWYGImage/file/10626472725.pdf
    • https://geelaboba.dswip.com/ci/userfiles/files/wopuzivugo.pdf
    • http://scoutpate.com/userfiles/file/211798374.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/17340654792.pdf
    • http://yuhao-tech.com/userfiles/file/livaz.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2kgav5e9p31vkmfpd5r59fbeir/14661181359.pdf
    • http://atomiccm.com/userfiles/files/kuvezexebupaxemuwozekodik.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/xafudoronudopadutaderuwu.pdf
    • http://daydeothe.vn/rich_editor/file/ziwap.pdf
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/66632104134.pdf
    • http://abbeloosschinkels.be/userfiles/file/parul.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/nofelaxixutasasuguzawo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pes+2012+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 16792 bytes
font_01_sfnt_off0000c790.bin
b31cd9acb87fbddd6d390c4cb32451b94a68fdb634a77f05c7fbfae42f41c2e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 10628 bytes
font_02_sfnt_off0000e025.bin
d6c5ba886eeff605c7f2bc0491762c93f84c7cd7f0306fa699d1ddfb4acbfb73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 14224 bytes

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