Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c0bfed7a23f6ea…

MALICIOUS

PDF

74.5 KB Created: 2021-09-10 13:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1030d0f166c5969e902243e32d516289 SHA-1: 8ac7e98ae20b74d307576d830c68ca3c6a2b41f9 SHA-256: 71c0bfed7a23f6ea933260a659fac67b6b7f5b651348da96e4fdceafb162f204
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://olgunbey.com/upload/ckfinder/files/sakakavezigukila.pdf In PDF document text
    • http://myphammonly.com/luutru/files/zupamegolugumowuwifo.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/navaviwaso.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fadupibezakexevurapana.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/megexanapizunisos.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/94781612502.pdfIn PDF document text
    • http://vce34.ru/attachments/file/lurapasedaporojuxel.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wukogus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd88ea374---11480166615.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/97348635479.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/22545057748.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/wosetovibojelu.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/lunopareladadevetuwiper.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/sazudenajupoderikon.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/davesiwewuketevomejujoje.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jetekikubulugotagupuli.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/65518806039.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/17820596040.pdfIn PDF document text
    • http://perksys.com/userfiles/file/23158087603.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/94522895799.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/bizugegaganozinenisele.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/zeginakulurobekanunofuw.pdfIn PDF document text
    • http://bresky.cz/res/file/bifiju.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/86138180367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=c+major+chord+acoustic+guitarPDF 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_off0000bfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 17160 bytes
SHA-256: bb7661036e643e089951248d0f797ba456b7305023f017eb9c18e2b5f2978b17
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10796 bytes
SHA-256: 9bc16c4531aeb0fdd29ed75bfa833f7e5ed1128f736d0e7fa1343805662a8611

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