Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded9a32e1fda0241…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 01:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 345e07bae506756dd637906898142963 SHA-1: 5091f44ba1e52c5aee44b1e0f75c98631d0df6de SHA-256: ded9a32e1fda0241dcb1f67722ab3282aff847f1afcd7ce0eeca9521b548e45f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of embedded JavaScript streams further suggests the potential for malicious actions, such as redirecting users to phishing sites or initiating further malware downloads. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=gta+n64+rom PDF link annotation
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/wuvulozutelenu.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210908082454.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f51d0e09---xixekofo.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/44020431820.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/kanexulaxiju.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/25307078639.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/wined.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/5362835263.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/sowitatupozuruxe.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090307353173499.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/mogatil.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/65586627642.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/7519206559.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/fagudijine.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/rabuxavotawunoga.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nabufojevesegikeluwadaju.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/90107202819.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4977521813.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/momejebanumo.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/pomujuwa.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/73408042982.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/82445402124.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/87155642616.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/morejofefowojidosexenuz.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/kurivotejemox.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 10116 bytes
SHA-256: 9ea06a9962a78efce45a2e4bc66f01938fd2e2bb76195cbe9e780a25cafa1a8e
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 18820 bytes
SHA-256: b062a0583d7a9497a3957496a5ffe8f5276a028613810f04818edbf826e1e786
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1