Malicious PDF — malware analysis report

Static analysis result for SHA-256 687550bcfe6a4db5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 11:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f655a6b1e79fc19e1b0bb5279ff93e2 SHA-1: 4c2cbfa07ad03adebeb968014c1c1469728fcdce SHA-256: 687550bcfe6a4db5b3657dc3bb18f9f70de65696f571938dcacc0ca670cce2d3
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on disposable domains, suggest a link farm or redirection mechanism likely used to deliver phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://saktigroup.in/uploads/47659447757.pdf In PDF document text
    • http://desushibar.com/userfiles/file/weledivo.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/24107876170.pdfIn PDF document text
    • http://flomojapan.com/upload/files/dudogemironaredasapefawix.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/janubuxekomazudu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/boperinetuwebefosi.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/1107658889.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/mekesifuxipijojosudibed.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/38231810779.pdfIn PDF document text
    • http://gabortech.com/admin/file/26433649128.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/jaxazere.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/57981559385.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/ludane.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/86445086740.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/gilagazukijikabojalekaji.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/kigowidikemadodabi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/72559760386.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d855156050---mepuputojix.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/264a227e0124ba3d5cb4139dabb8e012/33268787276.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/76097423632.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/68364259175.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/poxiboxenefod.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/kirumup.pdfIn PDF document text
    • https://svltv.in/userfiles/files/sedudezisujelit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pcsx2+android+apk+2020PDF 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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10668 bytes
SHA-256: caf9babecfd88414f7d32ed624e742965b2a81f9e25e08dcd94b6e4a27689dda
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 18292 bytes
SHA-256: 639dc5a955350d46a5cec0ca99f81668f91c1d58da2551ece3b77bb04e694655

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