Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e3c949e2ce0e18…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 18:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afed9cb9fa639d871c8d2aab88a6bbaa SHA-1: 95cf15bd29d5e5105037f3e3a640b9f15dafc48b SHA-256: b9e3c949e2ce0e18329fcadb60a725308777760bef0d16637e4b592707df1243
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are part of a link farm, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, with the URL containing 'strava+premium+apk+free+download' serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://www.slappedtogether.com/editoruploadfiles/file/zevipilusejo.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/wolixobej.pdf
    • https://riolospettacoli.it/filesUploads/file/12418218909.pdf
    • http://viprealestatebrokers.com/userfiles/files/42962206363.pdf
    • http://proleague.dk/userfiles/file/gawewovirijefobi.pdf
    • http://delta-serwis.pl/pliki/fodiziniz.pdf
    • http://adasbruiloften.nl/userfiles/file/48687368518.pdf
    • http://land89.com/ckupload/files/taxareta.pdf
    • http://t-p-fortune.com/userfiles/file/kawefomiwixowato.pdf
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/51811471161.pdf
    • http://akvari-um.ru/userfiles/file/64958086260.pdf
    • http://webspace.mysdam.net/images/newsletter/files/19816109303.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4bd6eedcf22f54a282a638e465ded46/gibebesixajap.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/53872543688.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/30988489140.pdf
    • http://kingsauto-bar.com/js/upload/files/meloz.pdf
    • http://goldenteriyaki.com/uploads/files/tuxavufew.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kufewadarus.pdf
    • http://mweb.cz/images/file/86844637949.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/86519339681.pdf
    • http://bulk-supplies.com/userfiles/file/sikavibalabexedapazar.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/xuguxotepibujefajo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=strava+premium+apk+free+download
    • 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_off0000dcd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 16792 bytes
font_01_sfnt_off0000f4e4.bin
4a1db7e511a0786023ab7db928694f52915d6ea9d14ac10eb9ea820eb0794faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 17388 bytes
font_02_sfnt_off00012224.bin
e725270bb9db3a58918ebc98f024092d5e553d8e57adb54420742c34074d25c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 10908 bytes

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