Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5e46624a20dccb…

MALICIOUS

PDF

69.1 KB Created: 2021-03-25 01:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8bbfec4134fbc05410d7f60206c95fc SHA-1: 7bc8fde4d5e0b3b09db929bb6edea5b086e88767 SHA-256: bd5e46624a20dccbb942b07fce6457e18792611a50d6323cf7458d5f9c3a85dc
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for a PDF redirector link to 'https://yafferge.ru/award?keyword=advanced+calculus+problems+and+solutions+pdf'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier output of 0.999649 further supports its malicious nature. The document body appears to be corrupted or obfuscated, but the presence of a malicious redirector strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=advanced+calculus+problems+and+solutions+pdf
    • http://flowerport.store/zetigea4s95.pdf
    • http://momexatajuma.22web.org/38744387573.pdf
    • https://sowidokobixu.weebly.com/uploads/1/3/1/8/131856306/guvinusavusaw_pawufaxe_tiliwe.pdf
    • http://kitexukel.22web.org/fabujuluzagugopexofariz.pdf
    • http://rizaxezo.iblogger.org/rejuw.pdf
    • http://stopnutristrike.ru/how_to_reset_canon_inkjet_cartridgest3v4p.pdf
    • http://nout-prodat.site/96092181789w21f1.pdf
    • http://tagukefinifofe.iblogger.org/49224506065.pdf
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/2920171.pdf
    • https://lapamijivosesez.weebly.com/uploads/1/3/4/5/134507295/33721.pdf
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/9186967.pdf
    • http://fitnesspack.net/pavikejozotkgw5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tufujifinobiro/hello_kitty_sheet_mask.pdf
    • http://xokowire.epizy.com/andante_grazioso_sheet_music.pdf
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_f6802b5c89fd4d66b3bf5bbf01e5cb9e.pdf?index=true
    • http://sedilone.epizy.com/15280510019.pdf
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_3ef4fedf8b4c41fd9023a4c941ac39ac.pdf?index=true
    • http://pibimosozo.rf.gd/kamalowisezitibepiginibiz.pdf
    • http://seluxud.epizy.com/framed_ink_download.pdf
    • https://s3.amazonaws.com/lemefofutomapox/fodapurubujejijiluponadin.pdf
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_0b5fb5f87daf4467a2e83c116f349ed2.pdf?index=true
    • 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_off0000cfb3.bin
49f08447a3b5487c40c8d00c4ab2cd636e68dfb44e4ccfc1b5a2f6d25642eb6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 5488 bytes
font_01_sfnt_off0000e249.bin
b7f1f22abae6e29e21667e16cafef2015445fbc15ff15bb7d4873ba1f0127c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10600 bytes

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