Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38ea10a0c66a313…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 11:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fa32750848235cb16bee40e49259a3c SHA-1: 38f99e0701ce658a32fa8b398d67a657f685b568 SHA-256: b38ea10a0c66a3137c6916a965a6567b6586c95b34388ffba4f253297484c645
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, presenting numerous distinct hosts with a single link each, likely to obscure malicious destinations. One of the embedded URLs, http://104408017.linker.tw/files/juposuwutajevaponigo.pdf, is a strong indicator of this malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://104408017.linker.tw/files/juposuwutajevaponigo.pdf
    • http://alhambra.kopanramen.com/uploads/files/57638689436.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9bb17ccdccfe95d0f757c3f7bdc89930/bijozukirupetufomafodaxut.pdf
    • http://kleni.cz/userfiles/file/41242209631.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/52011897309.pdf
    • http://clubselectionvoyages.com/images/file/46708772393.pdf
    • http://cortocircuito.trialpanel.com/images/Upload/files/83996871136.pdf
    • http://synphabase.ch/upload/file/balobaketapetu.pdf
    • http://kruengrangthai.com/files/files/53916913761.pdf
    • https://erdemlerkoleji.com/resimler/files/7237938794.pdf
    • http://ltmetal.com/userfiles/files/21603763554.pdf
    • http://alwaditrading.com/userfiles/files/27453081295.pdf
    • http://hebakotb.net/userfiles/file/fadedosepewiromeni.pdf
    • http://lednotice.com/userData/board/file/48090980931.pdf
    • http://hausdergesundheit.net/userfiles/files/91407785353.pdf
    • https://gifarlcm.com/upfiles/editor/files/xobuforunadolu.pdf
    • http://nsk-nalogov.net/upload/files/71946163631.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/gofojaxu.pdf
    • http://tungalag.mn/userfiles/files/12860919820.pdf
    • https://nestsearch.in/admin/uploads/file/ludizodofemagazolatodav.pdf
    • http://veterky.ru/ckfinder/userfiles/files/16218105899.pdf
    • http://joeun-it.com/userData/board/file/gegexutokozujuruzemo.pdf
    • http://agecarekorea.com/ckupload/files/sefebuxupo.pdf
    • http://travellerisland.com/files/vovemix.pdf
    • http://styrexon.cz/userfiles/file/52821084069.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+y+decrypted
    • 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_off0000ce46.bin
4f4e4c8c485a5196e136554caedc1cee5ef930b882d59745c99197af0bf2abc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 10416 bytes
font_01_sfnt_off0000e5dc.bin
fc557b3214ec97a3bd5b139422da6c84b95f834c42c8f2437594cb58607bb372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 19468 bytes
font_02_sfnt_off00011928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 16792 bytes

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