Malicious PDF — malware analysis report

Static analysis result for SHA-256 c498b3628dc4a30d…

MALICIOUS

PDF

88.0 KB Created: 2021-03-31 00:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36eee36136c1e8184b0575fb9df2cf3d SHA-1: 7eeb9d3587fc70589607c1096f32a71c98d96b2b SHA-256: c498b3628dc4a30d846428adec9af4e4d5f17e91563d4fd96a6c7c6205df35b7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to host or deliver a malicious payload. The presence of a 'download button' heuristic further suggests a social engineering attempt to trick the user into downloading the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=agenda+2020+pdf+free
    • http://popuboloza.22web.org/35355965327.pdf
    • https://cdn-cms.f-static.net/uploads/4454822/normal_6015368315a87.pdf
    • https://cdn-cms.f-static.net/uploads/4485711/normal_6023e2f9c6ace.pdf
    • http://fudidudigas.iblogger.org/best_goose_choke_for_stoeger_m3500.pdf
    • http://meetsucre.pro/juratetikamexunodi7cypo.pdf
    • https://cdn-cms.f-static.net/uploads/4382778/normal_605c0f4907cf6.pdf
    • http://gradstroy.su/how_to_change_oil_in_2010_priusfx9f2.pdf
    • http://gloslides.com/81342837417d2jh2.pdf
    • https://cdn-cms.f-static.net/uploads/4373520/normal_6036e3116565e.pdf
    • http://harmony-market.ru/what_are_the_12_steps_aa7a211.pdf
    • http://zatoboyvibor.fun/49820748495w9f0r.pdf
    • http://50off.pro/vaaste_lyrics_whatsapp_status_video503tq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_a04b5e97f9874a7588a96b72dcdb0b1a.pdf?index=true
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_a7ead52f68e341f28972205c6b84e854.pdf?index=true
    • http://pamakejexo.epizy.com/editable_certificate_of_appreciation_template_free.pdf
    • http://xelilurezo.epizy.com/adobe_flash_player_11_android.pdf
    • http://kosigasarem.epizy.com/xapujobevofajanogu.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_cac8d411809d4581af07559fdce117a9.pdf?index=true
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_8044cc1cba954b1a9b63b7935deccb31.pdf?index=true
    • http://duguteterexu.epizy.com/66767183949.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_3b24c9623fe84705a54364b24b360b7d.pdf?index=true
    • http://safefake.epizy.com/42131214755.pdf
    • http://fuvogixus.epizy.com/athlinks_app_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ab3.bin
2a3719ed744cd9326f8d062f5fd38e6437e706a91966b37152286141a56ab1cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 5264 bytes
font_01_sfnt_off00012cac.bin
60093d2ad92face310d319065f4f76d60c59a271fc7caf26ed24f7e4083cd4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 11196 bytes

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