Malicious PDF — malware analysis report

Static analysis result for SHA-256 065ce0dacf5dce85…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 07:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17323196e4d9aac75e714842dee854ff SHA-1: d2c33c657f40abafe0d8551cc7338a25caab60c3 SHA-256: 065ce0dacf5dce850fde6ddd0972e3278fb2be71a66099a6198ab844991864d1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable domains and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/wix?keyword=weave+silk+tiger PDF link annotation
    • http://tufodudem.mypressonline.com/18942180600.pdfIn PDF document text
    • http://1-bog.ru/57144476858dg6lt.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/gjPrjgp/dark_green_bubble_jacket.pdfIn PDF document text
    • http://universityru.fun/mini_teclado_inalambrico_bluetooth_android_windows_mac3xa6g.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/96289752606.pdfIn PDF document text
    • http://gufopitasuwo.22web.org/the_most_beautiful_thing_parents_guide.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/arcsoft_showbiz_invalid_license_key.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/KjejADO/collage_creator_app_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/84895358099.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/acls_test_answers_2018.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/how_to_program_a_ge_universal_remote_to_a_orion_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/2017_english_movies_in_tamilrockers.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 4988 bytes
SHA-256: 8e0f95f1306085ad5e0132525d6f7e6d115ec2e436f16201e85569ac5bf9ca00
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 11300 bytes
SHA-256: f2c245a6a9b8b433f6cda33f3f09e2a733b004039116c68f19a9e6355d757542

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