Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae6994b71725880…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 22:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 960ac171c81c2a6113896a05d225373c SHA-1: dc17bf521cc023449fd8bae89a210ded77342404 SHA-256: 0ae6994b717258800fe33d65932b2065fda93e14f60c6d758cf871c045f60b91
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://majstrissmt.eu/www-data/file/7056532367.pdf In PDF document text
    • http://yesfabric.com/images/upload/File/95638663615.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/16779848459.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/46027735834.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/4149256253.pdfIn PDF document text
    • https://jensbrode.de/files/file/vademigikujipapo.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/latilafavagukijo.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/jasikawovifusivenipubirip.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/70826104041.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/91251153077.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/17141099244.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/57081118300.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wewutalanamomar.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/besozotiremupubagejaxij.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/nurofujapatarupilovuveson.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/befonafe.pdfIn PDF document text
    • http://ruihuitax.com/files/file/89569407600.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/18990470133.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/12436110750.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/90664283591.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/66576703782.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613258bf4a1d1---34919732411.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/mokopize.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/viloxujovejetavuxapib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=raya+and+the+last+dragon+eng+subPDF 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_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 10832 bytes
SHA-256: e2f3975005316a73c2578be8b5cc60e641eecdaf4879302c5eb255de5df215b0
font_02_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 18360 bytes
SHA-256: 2ecd1f3ab8a048cb82c9e86bdb594be2ffa394eaa4259b861eb30abccbca1aeb