Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3b9784f460a2cf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 07:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d40844d2a96b654d520510b7fdf9bba3 SHA-1: 5a86d49990848a3449a03b27b89eb02517a540a0 SHA-256: 9b3b9784f460a2cf63d3431e011be38f9615789e19c4fd77706751deb127bc8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. This JavaScript likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The numerous unknown URLs suggest a link farm designed to obscure the ultimate destination, typical of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://whatdwellswithin.com/file/35279443971.pdf
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210905_060832.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eccee54cc---sakepi.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/wimadugifu.pdf
    • http://imi.vc/upload/files/86501694784.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/gazubopexudetesadomidola.pdf
    • https://chulintemple.org/CKEdit/upload/files/bodemizonuxasuxenubofi.pdf
    • http://mya1fc.com/files/ckuploads/files/56787169898.pdf
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/55704575626.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/16998169134.pdf
    • https://ncsccalgary.com/userfiles/files/21722224188.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/ladajurivojekaj.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/14059959129.pdf
    • https://alpasol.e-giant.net/upload/files/56754637623.pdf
    • https://ntc-container.com/upload/files/69328874900.pdf
    • http://novafish.it/userfiles/files/mifopodo.pdf
    • http://telek-trans.hu/editor_up/78724923775.pdf
    • http://erbamedica.org/userfiles/files/jajodoj.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/88789373884.pdf
    • https://7mark3t2-7aya.com/contents/files/72145712313.pdf
    • https://nusbetaja2.com/contents/files/18768437613.pdf
    • http://fipjp.com/userfiles/file/96228576989.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/juvozetoduranisotetepute.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/votiziwuvejij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ed+and+ing+adjectives+exercises+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd66.bin
cbd09f8ce4adaf62532b9fc99d9acfe32d1469de8a4068447be75982569dab1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD66 10912 bytes
font_01_sfnt_off0000d68a.bin
622e227af2f1333752a01592f80dcbe1538be6b065f9e66b46d97c0edda3edfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 16748 bytes
font_02_sfnt_off0001016e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 16792 bytes

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