Malicious PDF — malware analysis report

Static analysis result for SHA-256 a105101d7304e92c…

MALICIOUS

PDF

97.8 KB Created: 2021-09-14 07:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b37708c0678ebf6253bead932eaf1820 SHA-1: 44ee2206be32582496a2a137f3395f19adb1b5ca SHA-256: a105101d7304e92c0e8f7dacdb48bd29e333fa2818195a89cd355a0754ca75eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • 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.
  • 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://rfaaa.com/UploadFile/file/20210903185938844.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/99711729472.pdf
    • http://vssteel1999.com/ckeditor/userfiles/files/78881914239.pdf
    • https://7mark3t2-7aya.com/contents/files/muruvuxopaguvakeroge.pdf
    • http://masan315.net/board/imagefile/file/petolidonimodudeluzuk.pdf
    • http://youil.org/userData/board/file/rotimavu.pdf
    • https://limsurdua.com/contents/files/44179263174.pdf
    • https://mar3ol.com/Files/files/siwisujakoluxojofeloxo.pdf
    • https://lodoshosting.com/calisma2/files/uploads/90478627885.pdf
    • http://qdjshg.com/files/file/xepefuzewuwofiwirozus.pdf
    • http://impex-italia.it/userfiles/files/tinuboborexupuwuwamoti.pdf
    • http://commune-bourre.com/userfiles/file/minopof.pdf
    • http://idroter.org/userfiles/files/xaveviseluvi.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/67495707936.pdf
    • http://mabifitness.it/userfiles/files/wogexolivefolojes.pdf
    • http://bright-inter.com/file_media/file_image/file/buletukide.pdf
    • http://wwm-quanta.com/upload/files/83688539976.pdf
    • https://duproject.com/uploadEditor/files/rewejinit.pdf
    • http://pensionpoint.cz/userfiles/files/vuwuvu.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/fejigofowolop.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/4631764695.pdf
    • https://casaalu.com/luutru/files/94182809381.pdf
    • http://khiensa.com/UserFiles/File/lugaditup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=funny+english+comics+pdf+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_off000116a3.bin
61ae4f1bae7e33adf92850b01dbc933e49087d86486bb9fb06b049e841cff675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 11244 bytes
font_01_sfnt_off000130a5.bin
87017d29dd94bd47b1d755985d606879aff755e0d37a3222564e63a5230a27a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A5 18516 bytes
font_02_sfnt_off0001603b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1603B 16792 bytes

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