Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0ad3f1d3446dea…

MALICIOUS

PDF

75.5 KB Created: 2021-10-08 22:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 905f6e0383ffd9ff5321f787d8da3fe1 SHA-1: 3e70330785f9d8f22df6f9fd4c64c8a5c50aeba6 SHA-256: bf0ad3f1d3446dea10d98d405e75dc5642fc16e1a3a988f9c19d0d1c5f5b9af7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://allytemp.ru/uplcv?utm_term=guess+the+emoji+all+the+answers PDF link annotation
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/96968015849.pdfIn PDF document text
    • http://esipro.be/userfiles/file/nugonamasa.pdfIn PDF document text
    • https://bawauang.com/contents/files/bejodonarofalitujis.pdfIn PDF document text
    • http://pedraferro.com/files/files/tikatunodezavewaxuf.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mejapanaruxuma.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/norevijafalaf.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/19130469258.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/gasirekimup.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202110040101247486.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/medenifiragusaripo.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/73540667779.pdfIn PDF document text
    • https://promise-land.com/upload/file/91854142584.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/5385165921.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/sejurix.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/27610687906.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/7109558630.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/76960517084.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/weramakexi.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/misafenilosarol.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8be3534077af7998b43c85efea05256a/pefanug.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/75266991456.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/xotuveriruvunulama.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_off0000c186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 10728 bytes
SHA-256: 56f5e555dd9ce9edfb995ad939bf4c056a20fb893b8b1a5569651c1f7d6cbfcb
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 18200 bytes
SHA-256: 9647e54618f79436c7516c1c9bf5ff68ddd794f72062fac5db788eb35cfb53a9

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