Malicious PDF — malware analysis report

Static analysis result for SHA-256 221a335c4635113d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 17:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b830c871c4ed0ac59a930bb1556f9b1c SHA-1: 5fabb8c73327863c213a87bc82c92705c5d96e10 SHA-256: 221a335c4635113da71812380f18bb2cc97a4de69c9f177512c7f99dc2db3eb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to potentially malicious sites, suggesting a link farm or redirection mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=sniper+3d+modded+apk
    • http://caudafotografia.com/userfiles/files/78627636572.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613716b922801---suwef.pdf
    • http://canhtoanland.com/upload/files/4963353245.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/senakusipolapujejawizafut.pdf
    • http://www.deco-interieure.com/userfiles/file/toxusesukunudizedove.pdf
    • http://opgzvh.hr/upload/file/76463488864.pdf
    • http://videofilm-tv.ru/content/File/93026139564.pdf
    • http://oa30us.com/userfiles/file/22246112474.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/zoxedajakimixatixipobi.pdf
    • https://epgeptech.hu/ckfinder/userfiles/files/busufilowusij.pdf
    • http://svatba-emi.com/uploads/pages/files/34783272504.pdf
    • http://reopen911.info/media/file/timewezuwidilaginigo.pdf
    • http://gzhangqin.com/uploadfile/files/kesafo.pdf
    • http://travellightnepal.com/userfiles/file/voberaxiki.pdf
    • https://dolaodong.com/userfiles/file/10610376881.pdf
    • http://chi-kara.net/Upload/files/47565390678.pdf
    • https://juhaszautovill.hu/userfiles/file/47182076169.pdf
    • http://immobilieninvestors.org/userfiles/file/54655063636.pdf
    • https://ewastexperts.com/userfiles/files/xuxokadepu.pdf
    • https://ceccarmaramures.ro/userfiles/file/61283529146.pdf
    • https://dijitalsanat.link/upload/files/sopejenunigax.pdf
    • https://mayphotocopydogia.com/upload/files/tidofowutuvaj.pdf
    • http://akinmedikal.com/uploads/file/fopive.pdf
    • 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_off0000b85b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB85B 16792 bytes
font_01_sfnt_off0000d06d.bin
a08ab247b8707c9bb89faa019f9f076e4cfdefc480485c7aab0298326eb6eed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 16156 bytes
font_02_sfnt_off0000f964.bin
d3f64f7160eb1b1f2974471dbb55d289532d030b494650cd3b47ff7065e9b00f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10580 bytes

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