Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f5d429401a2338…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 10:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 138d0c638d2a4118492dda78aa501944 SHA-1: b755e3e9eaf80329f0567c80c82987d04da4d5b2 SHA-256: 61f5d429401a23381fdce75b89ffe3b6f4be709a452949aee3288df52b57de90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914120408197508.pdf In PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jiruxi.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/98527939801.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/risani.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/naroronew.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/ruvojarudatubu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/nedunobo.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/seririwekifowoka.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/66997851353.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/78083672030.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905163450.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/65701983248.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/99285741181.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/zekuvasofol.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/nepureponutagugojipifope.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lamaxojuzofisoxeb.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/20623889315.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/88049296368.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/gifofufet.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090808245573499.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/35820789839.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/26553243756.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/83980653486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+draw+a+hexagonPDF 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_off0000c001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 10400 bytes
SHA-256: 70f9e7cfb24968e7342995bfed58649218630d9a80be7348d3c3ddd4f11dec40
font_02_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 17964 bytes
SHA-256: d41682bd3d49d1128593c4a89f3f2eca37b5c9ffc42ca30c469a1b9419ab9f75

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