Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fd90d1c4085a39…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 05:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9848fdf7b48b30aaab314b66814e75d1 SHA-1: eaebfa1d6083ab904bc273c5bff522627c5373ab SHA-256: 68fd90d1c4085a39f47f5c60a7c77ffe83aa40f4a47ba7f6afe42ee587dd5826
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs pointing to suspicious domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points to an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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://coretry.ru/uplcv?utm_term=moving+sms+messages+to+new+phone PDF link annotation
    • https://minlinart.com/archive/upload/files/taxamakuvijurujutikab.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/59744959060.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/61708652574.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/8202674924.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/911bde6e2d786e349a8089229406339e/59198096150.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/tabejimaf.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/17478207902.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/tusatafijusereruduxigewir.pdfIn PDF document text
    • https://cargotavio.ru/files/file/neziposewomibetixusexiwo.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/vedirufisekotamexa.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/91762871518.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/pozizeroparur.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918dab638b---80047349713.pdfIn PDF document text
    • http://htcable.cn/d/files/40045764675.pdfIn PDF document text
    • http://planbmedia.hu/files/76235989231.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vunipujolev.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/reramowipumazigasemijuwi.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/75291644137.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/fufemitutigapinani.pdfIn PDF document text
    • https://menu2uplus.com/images/file/84304403193.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zafusososefesazopeguma.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/7673174655.pdfIn PDF document text
    • 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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 10700 bytes
SHA-256: 3827af0c9b3df92f05f2178be5018134710ad92a06a92ef824093386a09aa5a1
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 17764 bytes
SHA-256: d16927b9d387b8c8b587c695d730ea0c8f0df31abb41fcca3d49fac72a55c0d9

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