Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2df71768a30136…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 09:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1e964b77302a63bd9d54974c9527069 SHA-1: 6b3c822f679e8f52236b35f09398b6ba8fe2def1 SHA-256: 7e2df71768a301366c0c4f99a2433987c5d7fbe326558e3b809cf9057fec2e04
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, with at least one pointing directly to an IP address, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate effort to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://samsungvrvklima.com/upload/ckfinder/files/16888530348.pdf In PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/kegatenazu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8130eddd1---gekajivolidodofujiwemul.pdfIn PDF document text
    • https://10fci.org/userfiles/file/gelafi.pdfIn PDF document text
    • http://mayjack.com/upload/files/kaxuworubejorarepijidi.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/vixamukegelarajepelinevi.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/37166905743.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/daxowo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/48533651959.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/romadekuti.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908121542579.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/dokepalotifibisitirapid.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/mubopugatikafufunizupu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446792da3ec---fobis.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/88337971681.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/ripizi.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/43485334698.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/19863090967.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931b0b5d27---fesuw.pdfPDF link annotation
    • http://nbkhjc.com/uploads/202109/file/210904195740064616i6h7gd2j8xl0.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/22998774108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=last+day+of+survival+hackPDF 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_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 17272 bytes
SHA-256: d539ebdaec6a1b9b58314869b8ff49dca41e411b2e6eb300704013d12e97c394
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 10668 bytes
SHA-256: 0f4fe9f2a95eea6bcf6cf7835759a00139e4bb9a0d8383004e3e2d07d8d3ee59

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