Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ba8d5a93868c49…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 00:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fa1648b554dc0245a03ad94eec8d662 SHA-1: d3206df129e65d88440fb6dbad25916c190976f0 SHA-256: 49ba8d5a93868c49397d47ae1a7c924be2d930c5ad7d13a29e615c7ad1255d3e
154 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple links to disposable domains and IP addresses, suggesting it's part of a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://domainecomps.com/documents/files/34246247458.pdf
    • https://zhavezbozi.cz/data/file/71300995775.pdf
    • https://pielinks.com/UserFiles/file/fijedilikojokexav.pdf
    • http://locnuocvietmy.com/Images_upload/files/98793722560.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/jelosufanamibexajepewu.pdf
    • https://doublehair.center/upload/ckfinder/files/70521657975.pdf
    • http://marupi.de/UserFiles/File/3823765049.pdf
    • http://www.drivingschool-brno.cz/files/files/wafivamedinepuraj.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/lamapogititipovixa.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/daxilozapadixeva.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f4eb72986263588ad831265a5ca1de6f/51752169945.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c667f19c4b---puvevebised.pdf
    • https://zoldlepes.hu/userfiles/file/72942537078.pdf
    • http://z-him.ru/userfiles/file/kinade.pdf
    • https://candbco.com/ckfinder/userfiles/files/wupemawesobikexiwi.pdf
    • http://akgwealthplanner.com/crm/files/10110036965.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/foxiduxo.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210913194222.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/fijopofesogiwoganurili.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29c1490fb---75162027051.pdf
    • http://tencanpowder.com/d/files/wefogidumufunomeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+take+sound+out+of+a+video+on+android
    • 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_off0000e6c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 16792 bytes
font_01_sfnt_off0000feda.bin
d649cee41a815cff2abd3883ef19f3b9c889836a8fd76ade18d83e9c0236e9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10636 bytes
font_02_sfnt_off0001175e.bin
906398818244649d8cd18e53deba007c568651dc2cae0d693a375970e70d42f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 19096 bytes

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