Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16df8e1883be49c…

MALICIOUS

PDF

77.3 KB Created: 2021-03-03 18:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9d6c768eb7c85a2f35da0f672f7d102f SHA-1: 13a9ad6e638e65b6619c6d3fc147327e15a5d010 SHA-256: c16df8e1883be49ccff8c400b3b0ca121f7e440215f7c7b630ab0b70b9725d8a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or spam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://fokemale.ru/strik?utm_term=mini+crossbow+plans+pdf PDF link annotation
    • http://support-copyrighthelpservice-about.com/rewrite_the_stars_piano_sheet_musicfsy0b.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/fekabetoz.pdfIn PDF document text
    • http://circulyarkadigital.xyz/certificate_of_residenced9cmg.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/brothers_anthem_song_lyrics_in_hindirgy80.pdfIn PDF document text
    • http://playmarket-online.com/xifewiwxud5t.pdfIn PDF document text
    • http://idealica-ordina.site/fadapig8n6f7.pdfIn PDF document text
    • http://vojutivuzijan.22web.org/philips_8gb_2_mic_voice_tracer_audio_recorder_dvt2510.pdfIn PDF document text
    • http://naderuromopuru.22web.org/94994715431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segisubab.epizy.com/l_theme_piano_sheet.pdfIn PDF document text
    • http://kadekosaraf.epizy.com/9-_7_practice_equations_of_circles_answers.pdfIn PDF document text
    • http://xojurasonalefan.rf.gd/twisted_fairy_tales_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/best_brand_of_heat_pumps.pdfIn PDF document text
    • http://ritanuwo.epizy.com/free_homemade_wine_labels_templates.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_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 5388 bytes
SHA-256: e2c8347974e320d6d76deea7e0e9000e72f43bdf05d1799ac839ccd630942ace
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10892 bytes
SHA-256: 5683663c724ef65b0eedba1543bd9d45454a3a79f0ef7297f130b10e45550193

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