Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ab1d31204e5472…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 02:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00143348ba1831410c447b1dfbb4049b SHA-1: 349d03d142d23a645cbf7a356ad575a154d9f0fc SHA-256: 63ab1d31204e5472ce3068beec4c09dfa17fd57f7c0e3c4313ac0fcb1eb20065
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://angkorphotographyguide.com/userfiles/file/minawiwu.pdf In PDF document text
    • http://zhuoer.ltd/userfiles/file/36344576220.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zobopurin.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/2671425933.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/28071350039.pdfIn PDF document text
    • http://kite-surf.sk/files/8773858608.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/99612213218.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/xasajufiweg.pdfIn PDF document text
    • http://telecycling.org/files/file/58787625897.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/depuwewajejetidenuf.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/xugewesogikutiwu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/97a1a6e648eaea9675012cb5c673acd5/netururi.pdfIn PDF document text
    • http://chinalabware.net/d/files/98421794658.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nudir.pdfIn PDF document text
    • https://gdaniec.com/upload/files/rofasoru.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/jifavakopasokajipi.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/wifap.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/40624920165.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/semupexopibejogujeriluw.pdfIn PDF document text
    • http://telecycling.org/files/file/bisanarerul.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/29423076722.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/vafelebusagojesoxawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=unlimited+mod+apkPDF 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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 18832 bytes
SHA-256: 6941939cf3af8de73f80331f6c8df55dd16c62c3e85e98f8567b55fe4c14a1c1
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 10384 bytes
SHA-256: 935b35b17218c7b93646fe268c176afbd742633206d7c088cb0f02ba27ac2709

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