Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ad20179a2e583e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 22:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed76a26237c71187c14e78a0f74849b6 SHA-1: 331edcd9ae364666c89e6db9eb44ddd18975e452 SHA-256: 88ad20179a2e583ebe63f4d4f4ddb851ae22d3e652c1e276ed3d05122973a5c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://9ja-bet.com/userfiles/file/xuwex.pdf In PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/soxujajudozun.pdfIn PDF document text
    • http://neteyes.eu/editor_up/difunisuxageg.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/08/50574057573.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/86556436155.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138abfd59ddb---58718997295.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/sazibugonu.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/20084596231.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/fikipudivukutetipazal.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/nibuvigokowubujivugad.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fowev.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/3785157830.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/63258449898.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/xesop.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/vuzepaperowete.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/37449768406.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/68023276189.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/gipobivopewiwizo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/40196790572.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/kimowuwanolakomopabuwivox.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_E155D81A69373F4E.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/nonatosokinuzexup.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613931fb7eec2---69140638815.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sejotogerobenodilubivevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pubg+mobile+unlimited+health+scriptPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/xaxepipopixuron.pdfIn PDF document text
    • 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 11204 bytes
SHA-256: d7d18280a5a934ea1536f3786aeb7e6c3036a9963b00f885e80984316fca8a29
font_02_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 17012 bytes
SHA-256: cfb04e92d86721f709fe18a0fd710f2f15be37c9d0ac5c14a47c8d4feae7f00f