Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fb99fd6866a3fc…

MALICIOUS

PDF

94.3 KB Created: 2021-05-12 06:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7c5b76af5910f05b56adbb2a04ccd6a9 SHA-1: 77bc98e9db0bd4f8a6a13f27518530cdf5f66b41 SHA-256: 53fb99fd6866a3fcf6104d7959f1f65c949799a0eda36d3091115f80fc7dd1da
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous embedded URIs, particularly the one pointing to `mezovuduw.ru`, suggests it functions as a lure to external malicious content. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its specific pretext, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

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://mezovuduw.ru/strik?utm_term=singer+5523+scholastic+heavy+duty+sewing+machine+reviews PDF link annotation
    • https://cdn.sqhk.co/milatepoz/hge30hi/88043241452.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/lolalivi.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/rulam_jerit_suwemi_zepegotudopofoj.pdfIn PDF document text
    • http://lg-copyrightforms.com/60083987200kk8u9.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/5001921.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/ggjiqjd/94222342669.pdfIn PDF document text
    • http://jushq.pro/cerebral_circulation_physiologyy2y1z.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/jdgjJic/plants_vs_zombies_free_download_mac.pdfIn PDF document text
    • http://social-whisper.ru/12338540652ow0xv.pdfIn PDF document text
    • http://yewes.space/smok_procolor_manualpcu02.pdfIn PDF document text
    • http://lassituda.online/97090126856c3a0h.pdfIn PDF document text
    • http://urologo.store/dufipanulubuzijy4zc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a2c937-0086-43c7-8014-f47fb7a59ce4/bosel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd5008e-f1c1-4cbb-9e52-4d02323a1882/speed_queen_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cb6a5c-d41f-49c2-b26a-be1928084e60/a_time_to_kill_sequel.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_991100a71202493e85169e15bb17ad41.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_638be652ef3045d6bdb4c482565e5d16.pdf?index=trueIn 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_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 6128 bytes
SHA-256: 819d856468ca07780491f9b7ba8dfc057df69d11b84b978d940f6777d260438d
font_01_sfnt_off00014500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 11444 bytes
SHA-256: 7924af7f018c7b63f33bccc690ddfa6fe53cc4eb8829affa8f13cbf3a3f2fba6

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