Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b9cda7e5836938…

MALICIOUS

PDF

79.2 KB Created: 2021-02-01 01:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e796583f33280479a6aff7e5e34b28d SHA-1: c54307d1c2ebdc75eeac6a4676bbda3b5665d863 SHA-256: 76b9cda7e5836938c766e2310e6989c1ded85814322d93db3988a347d6e89082
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs likely serve as lures to phishing or malware download sites, indicating a spearphishing attachment attack vector. 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-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/aws?utm_term=file+pdf+b%25E1%25BB%258B+%25C4%2591%25E1%25BA%25A3o+ng%25C6%25B0%25E1%25BB%25A3c+trang In PDF document text
    • https://cdn.sqhk.co/jagapifa/Nugfz7r/82451131569.pdfIn PDF document text
    • http://streamsweets.com/61160727779s5xve.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/jajgsry/sexufinomugefujepo.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/hahaDid/8d_audio_english_songs_free_download_mp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5fed3da2bd175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ff4185c3a8f1.pdfIn PDF document text
    • https://cdn.sqhk.co/fafegatoko/j7iahgf/51858773850.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/mDthajj/crash_dive_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ahbz40z/best_brawler_brawl_stars_2020.pdfIn PDF document text
    • http://manybigs.space/514166286455bf8j.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/hdjfidt/my_little_pony_unicorn_rainbow_dash.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/idyTYid/xiluvekamevogelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5febe680531cb.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/eijFCbr/alien_zone_raid_mod_unlimited_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5fdd00c02f38b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459937/normal_5fe269efad3a0.pdfIn PDF document text
    • http://dkmz1.club/23972970244gr8e2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 6016 bytes
SHA-256: 83c9835ab556af133c21d25657c1840314961290b8105e103058ef1c75839570
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 10640 bytes
SHA-256: f83dad4aa4f88ebfacf021975feac89440d78406cf7ba18c223f953d4cb11e2c
font_02_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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