Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc38705a20f09ec0…

MALICIOUS

PDF

76.6 KB Created: 2021-03-18 11:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d3864240fda5a1add91e3b47ea8216f9 SHA-1: 2f703b8de12f68af53a9dd37332f867dbef2fb9c SHA-256: dc38705a20f09ec05d6a3d4e7b339a16b1150a49cbb16bdd8a485300850ef0e2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, suggesting a phishing or redirection scheme. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using the document as a lure to external, potentially harmful, websites.

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
  • 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://jacksth.ru/strik?utm_term=elements+of+cellular+radio+system+design PDF link annotation
    • http://lnstagramcopyrigtservice.com/seed_of_chucky_full_movie_download_in_hindi_480pjkcrz.pdfIn PDF document text
    • http://lojasamericanasbr.com/55766449740kv1mt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382619/normal_600144cf9bac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5ffe7f5f6dc67.pdfIn PDF document text
    • http://roskycnmx.com/como_se_elabora_un_mapa_de_riesgo_comunitario7kbja.pdfIn PDF document text
    • http://eurozone.pro/88159900607f5ay4.pdfIn PDF document text
    • http://gelchlen.fun/furowujubujadg7hv1.pdfIn PDF document text
    • http://azalea.store/bovatikiwufuw7wz6p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_6041ad6057ced.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_8a38bd487196423ebf700ec522e90788.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/6716784339.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/92259837402.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_8ee515b098764d468a524b8a82a33048.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_7abd0dc243974aa2a04607a10ef677ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejifavo/big_wild_thought_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/vimala_alphabet_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/livinilozukobo.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/vugedotokikobigepiketi.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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 1604 bytes
SHA-256: 565e99d64711d6a9d59e14760bea8d85aa0dcd6973454cc7c2ff7caa52474b5f
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5400 bytes
SHA-256: 4870787d0ce1895cfd6273287fdc7cc9ce4f47513d91f1fe20f8f73c75f6c5f9
font_02_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 11024 bytes
SHA-256: e946e08079928c588afad926e1011e29c1a3de1559069f9bf6d0e7d6870a0668

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