Malicious PDF — malware analysis report

Static analysis result for SHA-256 4921029fac331117…

MALICIOUS

PDF

66.8 KB Created: 2021-02-21 20:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83e54673307ceb54aa7753bc1077c103 SHA-1: 0c572cc52651fc2d79f7f1330e0f6515fc08c50a SHA-256: 4921029fac331117e78c1d84833e234fe7a329c8c779b6b1160a19d38d19e11e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=unblocked+games+achilles', indicating a phishing or scam attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link strongly suggest the document's purpose is to lead the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wix?keyword=unblocked+games+achilles In PDF document text
    • http://discovljzg.fun/76599472860xxzjc.pdfIn PDF document text
    • http://reduslimitalia.site/acls_test_questions2ip5m.pdfIn PDF document text
    • http://reduslimitalia.website/do_you_need_oil_to_air_fry_chicken3v2mz.pdfIn PDF document text
    • http://mavpa.fun/zogerevolepijolukjssoj.pdfIn PDF document text
    • http://creditpm.com/play-_code_promo_codes_for_playstore_and_appstoremg1uz.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/pusori/cameroon_visa_application_form_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/39249339123.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/44968515662.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/35903997788.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/long_division_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/lezekemuj.pdfIn PDF document text
    • http://zapuwoz.epizy.com/84360034795.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/72580180288.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/construction_project_budget_template_xls.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/autocad_car_block_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/wusutimexiwezarur.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_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 5452 bytes
SHA-256: c55536983b3d8eeba9bd8c3fe9586e8b843500e8e5b000f0b12f8696b9afd6a0
font_01_sfnt_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 10144 bytes
SHA-256: 643ea10a306a0035889ff75002d8e14f8cd4d1f9bf954b884bad3c32be20cbc8

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