Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd72646b1584904…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 16:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2663776955d05527a9b5145fcb9f3025 SHA-1: 83453571162f6bbb9bf4b71a594fea7f073a2335 SHA-256: 7cd72646b1584904fa1844b990487c14c6b50ebf70eb554db3e1742ef81ae395
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a network of external URLs, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rafaelokazakov.com/file/40419836141.pdf In PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/61946500506.pdfIn PDF document text
    • http://climtech.com/files/files/1978688681.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/gabegexatesojevorizolikor.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/xejefexotizezojafokipuf.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/zafuminu.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/29838887592.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95672341538.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/rerejamidozan.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/54217028364.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/divaderere.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/dazevirutesisomew.pdfIn PDF document text
    • http://precisao.org/files/files/84682758717.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gesevoma.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/34944843529.pdfIn PDF document text
    • http://slsnn.ru/content/file/fusimuk.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/vedixupodo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e66f3d56ef---62078135424.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/70274625578.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2082_20210912215744.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161359780d2839---wojajog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+write+address+on+large+yellow+envelopePDF 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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 10824 bytes
SHA-256: a2ccf3bc6cdedadf9023ecbe370c63df88f86f206478cf33f87f489206d22e2a
font_01_sfnt_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 16688 bytes
SHA-256: a4c4a5342b540c71f9f4d7bd768f563a256bd4eef8f7528389cafbc281dbdfc6

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