Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c3062972b31a89…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 03:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99beff16824718e2da2a18a2b5ffd8dc SHA-1: 4cbf66e209e3c659e330d15b41b777601fce6b66 SHA-256: c5c3062972b31a896cb04e8c3c909b7040de9e5a27d40be9cf0ff01118422300
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to unknown domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zzhqhi.com/d/files/welodi.pdf In PDF document text
    • http://tuanlongland.com/upload/files/15066629837.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gugifabopipowumijimagafi.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/5300065318.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/6123228716.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/99417948199.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/68135765485.pdfIn PDF document text
    • https://stauber.lt/images/files/14928426646.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/gativiwopase.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/tumagabapagasap.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/gonefaleviwot.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/geduduvizazoxifowa.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/zazokadukepo.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/femuzevejuvidix.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/kerov.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/66102172591.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480626eb882---69572643757.pdfIn PDF document text
    • https://12shio1.com/contents/files/ruxivuxeku.pdfIn PDF document text
    • http://industrialdevices.in/uploads/bipulukokajupil.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/62953335747.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/9853888527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+martian+free+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_off0000af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF70 17880 bytes
SHA-256: 714d12e060527f49147a2d7d2f9b928b1721524d7dc16ccd272941e24f7f9af1
font_01_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10500 bytes
SHA-256: 00d5b5b5452c1260a698adbd651eb29a75a8ce0db3a1e74217c4bac3c12734a4
font_02_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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