Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2dd2bf470c17f8…

MALICIOUS

PDF

69.0 KB Created: 2021-10-04 19:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 050e25b0b182bed41ad00dbc25a82a85 SHA-1: c0e5cbf5ddc86fb51198b22a4eed6984fbe004e4 SHA-256: af2dd2bf470c17f8fce9901b311842377a8f5a31ef26fe308edcd8c6fb0aec2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://yokosohk.com/files/fckfiles/file/baparumavovuxuroremit.pdf In PDF document text
    • https://hmanagement.net/userfiles/file/18062961201.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/41494960391.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/fotegu.pdfIn PDF document text
    • http://15881588.com/ckupload/files/51832369775.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/27090383640.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/53260787675.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161382912a42fa---27885721407.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/disidavizibitapu.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/7278477450.pdfIn PDF document text
    • http://szhlfz.net/upload/nubulefitiwiluzopevaref.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/wetalikotisubip.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/zumuxevul.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/junodov.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zuwigafevokiluwulu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8adab64642db059c10a59256d90eb01c/47402160260.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/pokujafapevoparavanafef.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/gufunolenap.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/nikonorekufafolumeg.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/beboxipiratowutifilekasi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/nudaxogowabudasisas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=imagery+worksheets+7th+gradePDF 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_off0000af4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 10744 bytes
SHA-256: c757bf6a910a7d8f9bce1f6946d01e3201b50b7e83af51b32aea16b4cbc7315f
font_01_sfnt_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 15372 bytes
SHA-256: f1bc2c866d4782cbe89843a5d622b1bfb7a0d92245765182be84deda9fcf80f3

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