Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b62d0d7d317abcd…

MALICIOUS

PDF

70.3 KB Created: 2021-02-23 23:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 66133f2827d1163d93ad3da5a7156aa7 SHA-1: f600e29c93320ca48a0f58a9f77dcf4ece3331af SHA-256: 6b62d0d7d317abcd26642914e65f0cabb9ea8bbde08de257ba8a93aaf0a9a9ff
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are associated with redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for malware distribution or phishing. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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=annie%2527s+song+john+denver+lyrics+deutsch In PDF document text
    • http://ru-1.casa/hp_smart_tank_plus_551_aio_printermkh11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_60172b50b1a4d.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/hc82Tic/variable_colour_temperature_led_bulb.pdfIn PDF document text
    • http://itdomen.fun/why_wont_my_kenmore_microwave_heatf052q.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/cSbKjij/jewel_match_blast_match_3_puzzle_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_602c725c98eb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fe162ad647bd.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/hjhahbJ/gangmasters_licensing_authority_active_check.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_5fe7b153a1589.pdfIn PDF document text
    • http://videohost.space/demande_report_audience_tribunal_instance6etmh.pdfIn PDF document text
    • http://elerctum.org/jakuwapadabogitejirule2rx1z.pdfIn PDF document text
    • http://goodnatural.space/tres_veces_tu_libro_completo_en_espaololo9l.pdfIn PDF document text
    • http://vovality.club/how_to_speak_english_fluently_in_10_days_in_tamilqiy55.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/sjdGjjC/dowufitasuxijonufi.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/tJidih8/word_chums_remove_game.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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 5252 bytes
SHA-256: eb56a0647ddfe17b31cdfdb39f2ef28ff8eb0a7a239ace30da5181187587e721
font_01_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 10632 bytes
SHA-256: 97296b67a578d316e629afbd2b0d14ee311070b95b0d626e5a6d5e10990b8e0d

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