Malicious PDF — malware analysis report

Static analysis result for SHA-256 632781b2faee5675…

MALICIOUS

PDF

75.5 KB Created: 2021-05-22 20:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e51c6fbb291043b491e2b83d04567f23 SHA-1: 50226e0ff66e5c53574ab50410e14cae2775b494 SHA-256: 632781b2faee567541aa1d3d7a7b4db20852d963af6ca183876046d8ea51ce34
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment

The PDF document contains heuristics indicating it is malicious, including ML classification and ClamAV detection. Notably, it employs a 'Clipboard command execution lure,' instructing the user to interact with the command line. An external URI, 'https://pelibifir.ru/strik?utm_term=video+converter+avi+to+mp4+online+free', is embedded, suggesting it may be used to download or redirect to a secondary payload.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://pelibifir.ru/strik?utm_term=video+converter+avi+to+mp4+online+free
    • https://static.s123-cdn-static.com/uploads/4447436/normal_5ffb3f1493539.pdf
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5ffc652b84fbf.pdf
    • https://cdn-cms.f-static.net/uploads/4404739/normal_602edfaee3c1d.pdf
    • https://cdn-cms.f-static.net/uploads/4387709/normal_605acebf48631.pdf
    • https://cdn-cms.f-static.net/uploads/4408589/normal_60650e7f5b65e.pdf
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5ffc4fdaf1dec.pdf
    • https://cdn-cms.f-static.net/uploads/4388280/normal_6065da4bd5f45.pdf
    • https://cdn-cms.f-static.net/uploads/4373281/normal_604f3f01c0ea6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81533654-498f-464b-8525-c401e09b6189/41905717208.pdf
    • https://uploads.strikinglycdn.com/files/f1c7932f-31e6-4bc2-a9a1-6b972ad2e180/53079008237.pdf
    • https://uploads.strikinglycdn.com/files/df6d89a2-5053-4843-8c92-a509bbdeb888/onn_tv_codes_for_charter_remote.pdf
    • https://uploads.strikinglycdn.com/files/a47b9ecc-2a92-4b75-a867-05703531b4b4/rudal.pdf
    • https://uploads.strikinglycdn.com/files/5c157729-4793-4a86-af2d-131b08be10ab/the_future_of_life_insurance_companies_include.pdf
    • https://uploads.strikinglycdn.com/files/102dcef7-ea2a-47a2-b5d4-e10db6769121/cursive_writing_practice_online.pdf
    • https://s3.amazonaws.com/rogugagatuf/5185951746.pdf
    • https://uploads.strikinglycdn.com/files/3dc93a07-4535-48cb-8b3b-7e9160847707/wibiravo.pdf
    • https://uploads.strikinglycdn.com/files/796ad24c-4974-42c6-a9a7-6375109370e1/timex_expedition_scout_40mm_review.pdf
    • https://uploads.strikinglycdn.com/files/bf439d14-4574-4ab3-89a1-26e3efb6ae54/4211634072.pdf
    • https://s3.amazonaws.com/julaxel/76697217629.pdf
    • https://uploads.strikinglycdn.com/files/491a8d07-d4a5-4201-ac2d-ad5ec5fea20a/tirobole.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_off0000ea4a.bin
a2756d64351debeee8d2bde3ea36954702ad2e6e808ec0e78f9c90d112bec2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 5236 bytes
font_01_sfnt_off0000fc15.bin
da7f47ef8172152ca43e1fe3815cc7fb854d4cdc6ea3403e0e491e674604eaf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 10668 bytes

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