Malicious PDF — malware analysis report

Static analysis result for SHA-256 1998238a65ba8b9c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 02:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14977d00aeec3057115683cde6559fd0 SHA-1: 67c37bd17151e98081f218c762366a9c68397a48 SHA-256: 1998238a65ba8b9c0f0e85c68df3019f055fc7c88fbb3e160bb06320494d5e7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs pointing to potentially malicious domains, indicating an attempt to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaies.cn/upfiles/210919055242707926suaol3.pdf
    • http://nenorm.com/files/files/davokuvasadeta.pdf
    • http://twgo8.com/uploads/base/files/202109170543158588.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/metekaxoxivol.pdf
    • http://phuocthuan.vn/images/pic/file/60746444908.pdf
    • http://gallery4walls.com/upload/editer/file/sidafe.pdf
    • http://ulv-fogger.es/d/files/15717598359.pdf
    • https://giriconsultancy.com/content_files/files/zirevidalujakodusifax.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/8933968730.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/84721409438.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/57751653898.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f620094e19---zukefomimixililulanezov.pdf
    • http://oroblupiscine.it/userfiles/files/wozirisopidanir.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/56420669019.pdf
    • http://artgraf24.pl/userfiles/file/sanunusekefuz.pdf
    • http://purofirstli.net/userfiles/file/wedugopafewezuxapo.pdf
    • https://betamachinery.sa/other_files/File/bipob.pdf
    • http://color-gateway.com/userfiles/file/5116368910.pdf
    • http://ekotop.eu/userfiles/file/7252583866.pdf
    • https://penmypoem.com/new/admin/uploadfiles/file/32963302349.pdf
    • http://dxline.eu/userfiles/file/13290974429.pdf
    • http://stavebnevyrobky.sk/www/upload/files/53508848216.pdf
    • http://asbazainville.org/userfiles/file/dawozinegopero.pdf
    • http://accessiblevehicleservices.com/userfiles/file/wusepurudisebofel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dark+theme+icon+pack
    • 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_off0000da96.bin
da2978de44f7d63d8ab8584b9b6fcec104fb33b3e541bf83682ba58a3270af78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 10516 bytes
font_01_sfnt_off0000f255.bin
9a8afa20b9f835d14ccb4181ec2de49dd944fdfdf284bfb6c22ee714c45b8cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 18908 bytes
font_02_sfnt_off0001236a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes

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