Malicious PDF — malware analysis report

Static analysis result for SHA-256 215ac466a2a48672…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 01:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d428dc98a859d4bf0636f2ab38ce2534 SHA-1: e71b9dcd0c18a5f2a47c485e0fa83c96336b2bc1 SHA-256: 215ac466a2a48672f1feddb86620601f545cc7303108834b41282f4916957ed9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to disposable domains, likely to distribute malicious content or phish for credentials. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://ladymamashop.com/uploads/files/202109151649284439.pdf In PDF document text
    • http://gysanya.com/upload/file/210901160607274732z41bwv1g5x86.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mijupifosatarugofamiwir.pdfIn PDF document text
    • http://fxlcd.com/upload/file/22741448412.pdfIn PDF document text
    • https://olterus.net/contents/files/52660530258.pdfIn PDF document text
    • https://socardan.com/userfiles/files/55645738395.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/setudevifawamez.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/ligupul.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/voramopeg.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/91316040067.pdfIn PDF document text
    • http://traviet36.com/upload/files/65958221843.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/79062369938.pdfIn PDF document text
    • https://digireg.nu/upload/gavoxegufotapuzufope.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109020829351974.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/53984801296.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/5698196003.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/zuzapuzazamatu.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/farix.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fikupegimivupajoxurozusu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8655f3d3---jixuwonunevirinezewo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5ca6ef61---zorubonikuxep.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/zebunim.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/sinewaxewimosomeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=valid+credit+card+numbers+with+cvv+and+expiration+datePDF 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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 11244 bytes
SHA-256: 75f9751762feda5e40088168706d72218524e34b66392911eb6332fb95a98101
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 16848 bytes
SHA-256: b550a178121243756ef327520abb4194cb91a21b73d86bafe55a4f191ba9f4ee

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