Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3d8957b07bfb7e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 19:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7018a04e15a088fdc518601d6404d608 SHA-1: 7229c3a536dc67b1896dca4f0dc9b7200a1565ca SHA-256: af3d8957b07bfb7ed0d6945909e3c487b1efcee385cc16a3b5b4ef58ef58c284
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with multiple heuristics indicating it functions as a link farm. It contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://nomylo.ru/uplcv?utm_term=good+witch+curse+from+a+rose+watch+online+free PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abab8fc50---48663395705.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/fosenaponafolivenuvoso.pdfIn PDF document text
    • https://tsolisp.com/files/file/xazog.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/29498562695.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/78540838193.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/87484229656.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/mikulakulutijatikipagip.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/96225217335.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaab9f0ca3---92705130976.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109020700445999.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/37792173288.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/zirefuwovafi.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/96788548990.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/lusidavudixipulekozeribi.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/fulofavefapibe.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/venowu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/xavaruvurimavenufevejirat.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/rofokelilobipogatetowured.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/47959183125.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/zifirexak.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/fijopofesogiwoganurili.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jojolidekebelilojuka.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/belefolubonajuf.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/82886269497.pdfIn PDF document text
    • 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 10964 bytes
SHA-256: 0d9807c8b9af03db517d2546662d0eb3ec4901ed3649a357145014940250896c
font_01_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 17744 bytes
SHA-256: d2438f8da2eed0321f814c592ff1c846d59cb1fba7234c6b755ed9758b76af5d
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1