Malicious PDF — malware analysis report

Static analysis result for SHA-256 529f8f32b1fec51d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 14:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e80a735023200b2814853366a482059 SHA-1: 43fed257320d42b1587e9cb772321275431d7f8b SHA-256: 529f8f32b1fec51d24754d85cc312d79d0755a8dcbf7ec135275512b794dee90
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of multiple unknown URLs further supports this, as they likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://15449010.com/FileData/ckfinder/files/20210911_3D5BECC297B27759.pdf In PDF document text
    • http://musikpark-live.de/userfiles/file/lumorenipesarewigumexudon.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/tobabivom.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/gefizexazirebabe.pdfIn PDF document text
    • https://webhosting4.net/media/file/puluwojijaxoj.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ae1ea225722db2f5d2c4818414fdac43/49226966440.pdfIn PDF document text
    • http://guowangcable.com/d/files/48969633622.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/naxovux.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/setududumegozotov.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jilaborarute.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/45458134111.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/85630894401.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210906_827E56C91F58189F.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/gemunonategedar.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/tafoke.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071727068578.pdfIn PDF document text
    • http://yilip.net/userData/board/file/9765528041.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e94cd9e6---49617909217.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/woripurorokifitimevexadu.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/xibumosixojekade.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/18959172208.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/11504740409.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/pobemitipolijexuresoxat.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/gufozugafisovafawig.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/86241584239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+linux+syncPDF 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_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 10268 bytes
SHA-256: 9b174f048e8fbd8dddcb29a007c4159cb2773891aceab621053b3559e3c594c3
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 18944 bytes
SHA-256: 80267b3f99f83d75b1ba9f7df015b26d8d6e18947017ce2e5dc7052ade6a7651
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1