Malicious PDF — malware analysis report

Static analysis result for SHA-256 6467c6be5ee5a3ec…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 09:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20386d0eb385cebb7db97bec1df3b7dd SHA-1: edf2baa4884f5ef796242f8fea791d1b01bbd2de SHA-256: 6467c6be5ee5a3ec32c4ee4278d7c9de1f6b03aec0df1288e34d79f32c0d2a63
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, indicating an attempt to execute malicious code. The PDF also includes numerous external URIs, many of which point to suspicious domains, suggesting a phishing or credential harvesting attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/76922687743.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc1bb4a43---7062368972.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/firajivimuwir.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vineg.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/96291789223.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gadijexilake.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/45146350529.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/52274959776.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51833058537.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/nofalufeb.pdfIn PDF document text
    • http://thevalleytrader.com/files/85428377428.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/89260318095.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/71166873340.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/5290826111.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tezofolitatukupi.pdfIn PDF document text
    • http://1careglobal.com/upload/files/lutukij.pdfIn PDF document text
    • http://reopen911.info/media/file/timewezuwidilaginigo.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/junibo.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/60955801869.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/03b84cbc671fe6cfc1d3d14807233256/kekuneloduvej.pdfIn PDF document text
    • http://ranchobg.com/img/file/gawikozegedodowebala.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/tugolazujoxuberovivak.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/6373589966.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/70302214893.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/finaweduzawesitijesakixig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=this+war+of+mine+cheatsPDF 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_off0000b4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 15692 bytes
SHA-256: 9aca2b5a777ffca5b885e1ac717ed862316a6d10cb78300102960e9ecd3b4401
font_02_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10604 bytes
SHA-256: d9a6505d2b9f45d2dd1bca7f9fb4deafd3a3572f8d357b2455df4c23067e55b5