Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac58ed7d3f4cea5…

MALICIOUS

PDF

96.3 KB Created: 2021-09-18 08:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f22e456335282b6bf052b79d0c0bfd SHA-1: 6db2dae001ab363572d6da8b236867ef32e12739 SHA-256: 7ac58ed7d3f4cea584bbee8f340808b433aa5fe86ac305cf08b4a3708541476f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to trick users into visiting malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/ropiruwexerevakupasadavax.pdf
    • http://kulturazebrak.cz/userfiles/122538441.pdf
    • https://geniodelweb.com/file/19664018227.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zepevodepavujonujepakasug.pdf
    • http://magic-mugs-factory.com/uploadfile/files/sirivorukidanokeritep.pdf
    • http://ac-kenigsberg.ru/files/file/fafadapokekuvo.pdf
    • http://agataklimowska.pl/userfiles/file/jusozija.pdf
    • https://highlander-inn.com/assets/userfiles/files/71694366242.pdf
    • https://fnb-concepts.com/images/uploads/files/bikugonawuzor.pdf
    • https://xenang-mitsubishi.com/fckupload/file/kuliduvo.pdf
    • http://china-engine.net/ckfinder/userfiles/files/19928243475.pdf
    • https://duocvinhkim.com/userfiles/file/patatikut.pdf
    • http://hocomesun.com/upload/xuzusuwedeka.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qfuimok4kolthnfi089a1e0st6/54511947554.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/nogowikadomedidarawele.pdf
    • http://cbafjvn.com/uploads/userfiles/file/rozadazuvijijuresopakeku.pdf
    • http://snabsz.ru/ckfinder/userfiles/files/nuwevuxujegepesudexa.pdf
    • https://ice-group.pl/userfiles/file/biduse.pdf
    • http://studiochiodo.eu/userfiles/files/61022788068.pdf
    • https://malmospelmanslag.se/userfiles/file/bitajokez.pdf
    • http://encino.kopanramen.com/uploads/files/12715173737.pdf
    • https://maychieuvinh.vn/upload/files/72631626709.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/31bd6f189bf3e362148a1822dc905da2/24677915028.pdf
    • http://ryyw.com/upload/files/2021/09/202109141448476613.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vedere+sky+go+su+tv+da+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_off0001118b.bin
a3246a9698eb92e1802b0f8679918a0473757d03440286f26745457252ca9aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 19060 bytes
font_01_sfnt_off000142ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142BA 16792 bytes
font_02_sfnt_off00015ad1.bin
926b424adb879df1ececdb7eed8f3daed2665552d740e03164f4bb5f48dc64b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD1 10716 bytes

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