Malicious PDF — malware analysis report

Static analysis result for SHA-256 5488da4983dc7bc1…

MALICIOUS

PDF

82.6 KB Created: 2021-01-19 18:14:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8781907aa9a32b9ccfda95e6966bc1f9 SHA-1: 7349171d6e4cbce4ab0aff045e76bb4f8700cbe9 SHA-256: 5488da4983dc7bc1a49b141e88a29eff554e28b41d3a3dcf1261937e8dc9a889
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link pointing to 'https://crophysi.ru/123?utm_term=duncan+high+school+az'. The ML classifier also strongly flagged this PDF. The presence of numerous embedded URLs suggests an attempt to lure the user to external, potentially malicious, content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://crophysi.ru/123?utm_term=duncan+high+school+az In PDF document text
    • https://cdn.sqhk.co/jabuvilir/Xjehjsb/keesler_fcu_mobile_al.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5fcdbe7c4544e.pdfIn PDF document text
    • https://cdn.sqhk.co/riluvexudeve/heie1DY/virtual_table_tennis_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/REvxLgi/until_daylight_savings_ends.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f915133cb1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5fbca0bb1990c.pdfIn PDF document text
    • https://site-1172896.mozfiles.com/files/1172896/billo_ni_punjabi_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_5fe6a9f5b7a95.pdfIn PDF document text
    • https://cdn.sqhk.co/mudixeguda/dhfghz6/mapiwipukotebox.pdfIn PDF document text
    • https://site-1178965.mozfiles.com/files/1178965/skyscraper_demi_lovato_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/mtiagcC/amazon_ladies_waterproof_golf_bags.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/senovafijakodadokad.pdfIn PDF document text
    • https://cdn.sqhk.co/dokederajo/hajcmUf/music_theory_for_beginners_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410954/normal_5fe0527358c79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 5012 bytes
SHA-256: 00e38366091c6cd72aafb6bc80ce2336a992a9c74cdcd747067daedada512ac5
font_01_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 11076 bytes
SHA-256: 35e872b7cdd0489f98ee4f4007388c56c475114087bf47a260379a229003f7ed

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