Malicious PDF — malware analysis report

Static analysis result for SHA-256 577f57d35b4a6092…

MALICIOUS

PDF

70.7 KB Created: 2021-03-21 09:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 02d908e96ea5b47c440d1f135d84b4c3 SHA-1: cd806c04d0f0578b91216510eeccec234e3e237b SHA-256: 577f57d35b4a6092c3e33043d785f9bbda13855c5461d7b37e0e4503a8846819
126 Risk Score

Malware Insights

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

The PDF document contains an embedded link that directs users to a malicious website, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to a potentially harmful site.

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://vilenefex.ru/wix?keyword=stagger+lee+lyrics+and+chords PDF link annotation
    • http://cancandance.org/i_speak_six_languages_sheet_music_scribdnxv8o.pdfIn PDF document text
    • http://a1metromovers.com/suledazujumenijisojarabsl9i3.pdfIn PDF document text
    • http://autobuff.xyz/fractionation_seductioncx5td.pdfIn PDF document text
    • http://pokemonrivals.online/logo_quiz_world_answers_level_2_united_kingdomxqjyr.pdfIn PDF document text
    • http://sallehq.xyz/6275999019040ije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_c8b0ea38bd204ea4b87ff92c1536e613.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_2443ffa16de74ff0b80b52380e8c1433.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/animated_emoji_android_github.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/vishnu_sahasranamam_path_in_gujarati_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/mcgraw_hill_biology_answers.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_9de06d1ca0914389b4598a39d3322ef8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/26003023973.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/checklist_template_qa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ae145e-671e-4b12-86cf-8622d4c9d729/samsung_galaxy_note_8_screen_replacement_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b239e97-1a48-4b9e-b728-7cde154ad3d0/what_to_do_if_an_employee_gets_covid.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/family_handprint_tree_template.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 5404 bytes
SHA-256: a7edc148ef18cd8d0ff8df4f8d16add3ef1cd0aaf6c5f61ab44f3dc29a0cbfcd
font_01_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 10724 bytes
SHA-256: 01ddc010c82cbfc5cb8c294e4b73fb10b23839322e1be3fdffbea844f0158c3e

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