Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f66cc0a9e58ac7c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 08:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa6d88c5469d00889b222091f74fb5de SHA-1: 5de395d329cd3ff429a1512d9bcd7f728ae5f828 SHA-256: 5f66cc0a9e58ac7c1679aa3f80f3ff9eab731957676e14d0a74bb528021827ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://szhlfz.net/upload/wunexifekomine.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/19809521815.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/luruziguxub.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631335715.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jixixodilexuremupiwawo.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/povajolomevo.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/vewabeviz.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/miwirerezijawidafegorikem.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/91029086320.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/kivodidomolilomu.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/18334407602.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109052228382455.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/nejato.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02b3a71dc---loturadusedeli.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/pegetepefewazimesesaz.pdfIn PDF document text
    • https://mytopics.it/uploads/file/58664503788.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/gilikazikesuxewomapigono.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/75234339231.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/98898585878.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211563473499.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/73154798721.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/90606595515.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/60678123226.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/65581473003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=framed+perspective+pdf+free+downloadPDF 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_off0000c33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 10908 bytes
SHA-256: d78d29a460da7abda1a89778b893d0d7f6da580934183b4cceec3def14d227af
font_02_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 18452 bytes
SHA-256: ae52df4ea2083d878b5b1677692924f47d9a77cdb0a9935801f92826c039dcf3