Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af47237fa8b330d…

MALICIOUS

PDF

79.3 KB Created: 2021-02-21 05:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3f2dc532bf5ec66b63ed01be6fb873f4 SHA-1: a9e3533e6d510c9413ececcb9f18097e22d79003 SHA-256: 5af47237fa8b330d22253f28b63638a8d0a45c1febad2dd7f15d1b367d1db865
96 Risk Score

Malware Insights

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

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains an embedded URL pointing to 'seumenha.ru', which is likely used to redirect the user to a phishing site or download a secondary payload. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=what+is+the+theme+of+racing+in+the+rain PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fea4696430ea.pdfIn PDF document text
    • http://interbank.link/mubodexebenatutavum7tzpb.pdfIn PDF document text
    • http://buyfastedcircle.xyz/alcatel_one_touch_idol_mini_rom_downloadd0rud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600af0143d702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fd5f575853f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_600f090bc9949.pdfIn PDF document text
    • http://tricitysikhs.com/messenger_app_free_for_iphonep3wbj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fdefc1d902c7.pdfIn PDF document text
    • http://artelamp.store/44797431834jj0y5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446287/normal_6002d1445d1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_602808a778df1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405950/normal_5fcf444885b5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/42026722717.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/nusejovuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/cakephp_form_input_id.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/iberia_flight_delay_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/attagasam_full_movie_mp4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 5276 bytes
SHA-256: 9e0b1d313d9ee91602f136dd6facf03e1e6151a315c48c10c24c8bbaab7505e6
font_01_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 10872 bytes
SHA-256: 159348d0c5d66b9f9ef9450e9abcf096f4248ba7d67826660ae1e2e9f9a161d5

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