Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fd9d1c8e92a745…

MALICIOUS

PDF

93.0 KB Created: 2021-01-16 17:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 20c75c84cf950afa44fd9a64272b61e2 SHA-1: c9d4d1014682a5209ea08be91864691651664541 SHA-256: 54fd9d1c8e92a745d143297d26fded9939389f253b6c8a2e8782c8b6ca939d61
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, suggests a lure related to educational content ('Pairs of lines and angles worksheet'), which is a common tactic for phishing or malware distribution via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=pairs+of+lines+and+angles+worksheet In PDF document text
    • https://site-1168448.mozfiles.com/files/1168448/metronome_rhythm_exercises.pdfIn PDF document text
    • https://site-1228067.mozfiles.com/files/1228067/business_standard_newspaper_price_in_jaipur.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/esLibIO/wamebijidaxabiwila.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/mia6fja/descargar_blocky_highway_hack.pdfIn PDF document text
    • https://site-1179818.mozfiles.com/files/1179818/capsicum_rice_without_onion.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/15ojchj/ruxaxefexagitixep.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/viwoxuz/acute_pulmonary_oedema.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/sokuzijoguvuzenu.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/77778890580.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/gedujenazutanejexi.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fisoguvunuravejebudo.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/best_adventure_games_for_android_quora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 5328 bytes
SHA-256: 34be3d580f59ca2b81809d14955e9f2cca750e888b56a2f393c85b06e8daf574
font_02_sfnt_off000141e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E1 10160 bytes
SHA-256: 48f25841af05f873a7a6424f7e53f1424b157dcec04d78ee99b269828e44aea2

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