Malicious PDF — malware analysis report

Static analysis result for SHA-256 9339682b6f45470a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 14:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fa65d21e8d33d4773cbb58cb2117544c SHA-1: 2e7688e4189b2990640149d5ca0eb51508ee4c2c SHA-256: 9339682b6f45470aecdde7cb1e0b59056c57c68a60eaae4d68b92a0c9d63e240
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a link farm on disposable hosting, combined with a 'download' lure, strongly suggests a phishing or malware distribution attempt. The external URI points to a potential download, although its reputation is confirmed benign, the overall context indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fkjz.cn/upload/files/2021/09/202109071744122189.pdf In PDF document text
    • http://wittlich-luexem.de/userfiles/file/98293188711.pdfIn PDF document text
    • http://arucax.am/user_images/file/nusowizazobodaravazip.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/vabilosaz.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/vebesorajikevolikekusit.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/26823597347.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/81907178003.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/modejagebabefunow.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/41993848611.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/kikeg.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/pikuxosixilelewadaliz.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/lopop.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb65b43e27---3711409999.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/xokuxovanezupevepivoturo.pdfIn PDF document text
    • http://vaynhe.com/upload/files/96354675706.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/jerasiposomirarususinul.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/ziwisibexiwidixesetalekiz.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/90508374169.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/26266259628.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/76056133800.pdfIn PDF document text
    • https://hoavily.com/uploads/files/14217808317.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/64523992124.pdfIn PDF document text
    • http://theponghop.com/upload/files/rasafi.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/54031539510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=niazi+tv+10.0+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 18040 bytes
SHA-256: 0c41800e31da6a1de011f6c9dd93daea561063b2ca68b6e06e53a698d9d719fb
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 10508 bytes
SHA-256: e7abcb1d0cc4e9de33221eccfee0c5c8301225c67214a71a2db201e35fe49759