Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01cc24af063e490…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 18:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8ccb2402dad9ea6ab1f6f6dabe833ab SHA-1: 9209a42b684d4b39c52e5b8f0ea2bd8fa7804175 SHA-256: d01cc24af063e490cf000a3767c72010a84c7cb60d3e784eb645f3995283392b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a link farm with numerous distinct hosts and disposable domains suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ukrainski-rosyjski.pl/userfiles/file/72177936645.pdf In PDF document text
    • http://hurtglass.pl/upload/file/47690557533.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/38761380333.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/35995376399.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/18482283408.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/jujumozajatexabawot.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/10796263615.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/69188581264.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/kiwiran.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/3788135094.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/vevirezafulafuvesasow.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492960e4fda---46357007501.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/12957169710.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/soluworubumu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fomijizaja.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/luvezarofipififoj.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/viwudorupoxifabaja.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/98111032206.pdfIn PDF document text
    • http://rongqichem.com/upload/files/56880905801.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81438232687.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/85246143015.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/pewafod.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sapaluviposu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=top+sweaty+skins+fortnitePDF 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_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 15236 bytes
SHA-256: 4cf19337e391f7257dddd022aafd2e58bad1084f6418b31a04228cf58e9da281
font_01_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 10560 bytes
SHA-256: 652429dc39dfc6f22483505cc433096dd88f307fdaa97794225a36cf3014efeb

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