Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9589660196a45d…

MALICIOUS

PDF

95.7 KB Created: 2021-09-10 10:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3dd4b45dd2f92bd66987902e84cd0a0 SHA-1: a87fe854d40eb743159bc36b0be77fe8be5d3e96 SHA-256: 1d9589660196a45d4084116b86c160258a5e281111831ca47dd2c790f3ad95da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/26a019655ce75b9fe57aafe7ca9eccd4/81654552119.pdf In PDF document text
    • http://vicc.huh.hu/UserFiles/File/75812458919.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/32006429179.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/73601539166.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/vopexogujorom.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/dijoduvunevojerav.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/xifudupafafosudelogufav.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/35704637708.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/68328073173.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/fufajamelewunologiduk.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/37674576920.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/2523023637.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/rinelubukowa.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • http://airfa.it/userfiles/file/17408078697.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/58754653984.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/91155627215.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/94215656119.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/20294159029.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/nubovukutuf.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/152403669.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2b8ab22f3a7002fb2dfe04f4528f055f/ruxewude.pdfIn PDF document text
    • https://highrise.pl/file/50169996261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mouth+pharynx+esophagus+stomachPDF 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_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 17644 bytes
SHA-256: cbb0f1331a37e827118092abed42e946d83835d65e1f3a4db41612e66a29e857
font_01_sfnt_off00013fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157ED 10992 bytes
SHA-256: d9429b38e35d05baa48db9d15020491ff86f90b9969f3f7d485ad8fefcb81aef

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