Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf40a2665578d1cd…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 04:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b882b8cf8bc425b9e183c61ff06890fb SHA-1: 9963a655a6a882e9fbd5dc0755ab500d66f23989 SHA-256: bf40a2665578d1cdbbbdedb8c787ca2445c9c4815dd4cd42d0be3bbda662912a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=android+tv+parental+control+app PDF link annotation
    • http://bielle-srl.com/userfiles/files/25685434498.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210925081830.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/63713676190.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/30314281995.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/dunomene.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/16272411932.pdfIn PDF document text
    • http://kezmosas.hu/files/file/367239934.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/86793582622.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d794p3u53uq3005cl4grdv6i92/27026753341.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/jodezonitugevakebigom.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/85057763189.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/jurinotebikumawonuzefum.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/99489002436.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/fitidovomipa.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xibonarenoguv.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/labexosa.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/88265785103.pdfIn PDF document text
    • http://gibisch.com/files/files/xogowinizowo.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/dusifapipogiperefonedex.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vineroz.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/davawidinaburopoxalodixe.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/66371588145.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/73275429349.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/4240425885.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/8262982915.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_off0000b14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14E 10384 bytes
SHA-256: 9a393cadcb767fc81df2213fb47e5f85654b5489520f46110b9d619bd08203a7
font_01_sfnt_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17300 bytes
SHA-256: 0ff2e9db5aa231c7632f95b87c9adcdc5e07dae6c28f84f7655c5390827694c0

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