Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f95968ae93e9e88…

MALICIOUS

PDF

71.1 KB Created: 2021-09-15 23:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee6d2fc94364d3f4a3169ef580bf586b SHA-1: 3009bb4aab568b0aa0ec816ebe0e7d56f4a42a27 SHA-256: 3f95968ae93e9e88071c7241c1225a9231ab89637e9f325a41538d608178758b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for executing the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://servicedental.it/userfiles/files/wazuxisin.pdf In PDF document text
    • http://motolargo.pl/userfiles/file/42445128284.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/bidofikajol.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210910205426.pdfIn PDF document text
    • https://jck.ro/userfiles/file/gazatakenawafaz.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/44096931877.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/90061871674.pdfIn PDF document text
    • http://hybsch.it/upload/file/38940338968.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161401bb6c9b4e---86544890422.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tufiruzukolojabijuvinuzo.pdfIn PDF document text
    • https://kiptep.ru/file/dolexanew.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/bozovozizimup.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/11025385343.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/64435217715.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/3934591293.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/55903303038.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/zanoboxez.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/51561974688.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/keniz.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevaseludadikutenowuxi.pdfIn PDF document text
    • https://seerupit.dk/assens/file/lidulatijomitazap.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/mejem.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/12172015988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=frostwire+plus+apkPDF 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_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 16488 bytes
SHA-256: 1d9e802971f34dc33390a9bc403281fae26e27088cf466a8ed3230f58bbbb94d
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 10396 bytes
SHA-256: bd865c7e480383c4f166057558ee08dd22747c36cd0fe1ea266ec2423a5a04c8

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