Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1252f08c9e8d2b5…

MALICIOUS

PDF

103.2 KB Created: 2021-02-27 13:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 00ef9e3144cfe4bcbd29d2fc4e7edcc2 SHA-1: c5f31e2e0f5f85521fba389190884637422f7998 SHA-256: c1252f08c9e8d2b5a19b00d2c172cce163121f2856f2f142f510b08be7ad3d14
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'nipisod.ru', which is likely a malicious domain used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Texas instruments nspire cx cas games', combined with a visual download button heuristic, indicating a social engineering attempt.

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
  • 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://nipisod.ru/wb?keyword=texas%20instruments%20nspire%20cx%20cas%20games PDF link annotation
    • https://cdn.sqhk.co/gusiloxi/EigXVMI/ates_ve_su_2_101_oyun.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/Xhf5gma/coffin_shaped_french_ombre_nails.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/qCibWjj/93808940313.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/jgGQSic/kifujaxut.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gsCSSdH/bubble_shooter_dragon_pop_mod_apk.pdfIn PDF document text
    • http://sberpodarok2020.online/kufewivuxomiacs7b.pdfIn PDF document text
    • http://mizusowe.66ghz.com/carrie_underwood_champion.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/ggViGcR/cake_icing_masterchef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitatotol/50997526911.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/printable_butterfly_worksheets_for_preschool.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/cisco_jabber_android_configuration_guide.pdfIn PDF document text
    • http://tununik.epizy.com/lonutazisalizobarif.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/30292420856.pdfIn PDF document text
    • http://wukosow.epizy.com/90345032898.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/cinta_luar_biasa_chintya_gabriella_chord.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_off00014989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 5012 bytes
SHA-256: c47a9fc23c391ca3ee4cc1cf1488a0c491eb76350cb10ae922de58489f3d2b5b
font_01_sfnt_off00015a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A77 11544 bytes
SHA-256: b139a9954b5ee577b4efbb6c13b3247f9d5da4868e77f8700c071ae24a1e7a80
font_02_sfnt_off00018197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18197 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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