Malicious PDF — malware analysis report

Static analysis result for SHA-256 939f06d1f0066167…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 08:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec6319554afdba2a4895b4dea6a42094 SHA-1: aa101aca8cd7f8e1062c6fdc44d618fcc99f31fd SHA-256: 939f06d1f0066167e07bdb0d55f428e73a2d0231948c0d3350a7e8cc87030f49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, directing users to numerous other PDF files hosted on various domains. This suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://orangerun.re/photo/files/89162766291.pdf In PDF document text
    • https://srmhomes.com/images/bulk_images/files/furod.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/sudobebibisane.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/fukoz.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210915_200705.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/91971712698.pdfIn PDF document text
    • http://newshop.jp/archive/file/37330343548.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161374d2c10b28---pozatezoralowiza.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/repawevugujefexofadi.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tenoxuw.pdfIn PDF document text
    • https://wsbtitan.com/images/file/6901596966.pdfIn PDF document text
    • http://gabortech.com/admin/file/15804650313.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5e240aec---47158810578.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/61591334837.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/sagivo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/91083885986.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xemejunewev.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210916_306565BDBF0C8EC4.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/14960349010.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/09195349916.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/bivusenixisina.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/vuvesofusemafimupub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=a2+vocabulary+exercises+pdfPDF 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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 11036 bytes
SHA-256: e2b94554002779463afd4a259a643d75539d43052c4488b778572e7bf01dd27a
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 17208 bytes
SHA-256: 763f4bf4976f9fc08e69c3e8eb816fbc4d8f31416958776d69052af6f8b2eb24

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