Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed50101fb104d17…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 03:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c5a5577732bd84e3bdb14549eaf9bee SHA-1: 95e29d4fe3cb0faf4bc5e7c2f23cc5a39d61358f SHA-256: fed50101fb104d17ea523f8f71894bd33a5a04131f6c4b54ef605d8b076a0d51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a significant heuristic indicating it's a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to the link farm, which is a common tactic for SEO poisoning or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://espwireless.net/uploads/file/45565473989.pdf In PDF document text
    • http://hoangduy.vn/vn/files/nudatenorimewudix.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/79730712905.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/59082692995.pdfIn PDF document text
    • http://fruitsad.pl/images/file/97551347207.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/58579365479.pdfIn PDF document text
    • http://newworldss.com/uploads/file/papupula.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210907200911.pdfIn PDF document text
    • http://mayjack.com/upload/files/49120670431.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/44163156834.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/46219929295.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/10896438823.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/zaduvewokowuwiza.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/80930042664.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/91501281012.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/77148154419.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613098c51827b---61550251401.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/43088005037.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_8E854DE5CC55C7FE.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/11613846322.pdfIn PDF document text
    • https://rinducm1.com/contents/files/18298919733.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/2904548456.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f13760c5b---24473153357.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/japamizo.pdfIn PDF document text
    • https://pcetravel.com/files/file/28065901526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=geekbench+apk+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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 10508 bytes
SHA-256: db942dd777a328eeefa1eb5693bbe700833cac96b3ea91f55073fd7c5011cf14
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 18828 bytes
SHA-256: 6d6014460515a45b255b4041319ca740d3056cc73e36c6670851261e45f08a56

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