Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fdb6e150d1783f…

MALICIOUS

PDF

72.1 KB Created: 2021-01-22 06:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 975dc050032da483e2a18670e57874f8 SHA-1: 50e68ee4125c0918e1c60f3e2ffe50ef8f07389c SHA-256: 61fdb6e150d1783f259a8c2be01dbbeb7d35608c0097f1617b035bd96e5f6590
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a PDF SEO link farm. The ML classifier also assigned a very high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'html5 one page website templates free', suggesting a lure to download seemingly legitimate content that redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/aws?utm_term=html5+one+page+website+templates+free In PDF document text
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/rimujap_mapijedu.pdfIn PDF document text
    • https://site-1175951.mozfiles.com/files/1175951/74971173175.pdfIn PDF document text
    • https://site-1175555.mozfiles.com/files/1175555/nibafunoporiw.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/vibigidur.pdfIn PDF document text
    • https://fijozemubo.weebly.com/uploads/1/3/4/2/134234573/3973625.pdfIn PDF document text
    • https://firupafawaxif.weebly.com/uploads/1/3/4/1/134109114/2508048.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/bogijexu/dussehra_celebration_report_in_school.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/lagu_the_bravery_above_and_below.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/ajax_submit_form_data_jquery.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/alita_battle_angel_game_guide.pdfIn PDF document text
    • http://sugizujesel.epizy.com/48425073151.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/javascript_formdata_application_x-_www-_form-_urlencoded.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/acrobat_reader_dc_portable.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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 5536 bytes
SHA-256: 501b87acc415759037b97d4cbaede447d5c1dde1b48051bfab7b107eb4f9ac11
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10676 bytes
SHA-256: 47f543d40e10a4a8a270d10c93baa4b86029ebd9534a312dd35caa3753666649

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