Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b3de992bc61081…

MALICIOUS

PDF

82.0 KB Created: 2021-03-31 00:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 487a7b2840811d2cf505554ac8479abd SHA-1: 7a238ba1de37f0ad9958c1116aaf9359a4648069 SHA-256: a9b3de992bc610817c04a118289f8a5b7b21b6c427395be0efe428c9a36b4b6f
124 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs and heuristics suggest it's designed to lure users into downloading further content, likely a phishing or trojan payload. While no scripts were explicitly extracted, the presence of external URIs and the 'ML_NYX_PDF_MALICIOUS' heuristic point to a malicious PDF designed for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pelibifir.ru/wix?keyword=free+bell+ringer+worksheets
    • https://zumugewij.weebly.com/uploads/1/3/1/4/131483128/wifobodiwobifes.pdf
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/16e9d9bc804b.pdf
    • http://tegotapiw.scienceontheweb.net/bureguguxuripogop.pdf
    • https://cdn.sqhk.co/fujalapevame/0hjjgjj/38115597533.pdf
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/rogam-gasapujanum-wizavakugedodat-dobowovitob.pdf
    • http://lebofawudire.mygamesonline.org/printable_bible_study_guide.pdf
    • http://tijudozi.scienceontheweb.net/58668630011.pdf
    • https://cdn.sqhk.co/mudonisogub/vjdjiFQ/aristelle_sans_free.pdf
    • http://bikokobolo.sportsontheweb.net/gross_anatomy_of_heart.pdf
    • http://monajip.iblogger.org/xemaruwekidot.pdf
    • http://panedapupugaxe.22web.org/translate_animation_from_bottom_to_top_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zogadawedalifap.onlinewebshop.net/parts_of_central_air_conditioning_system.pdf
    • http://bavatesivo.myartsonline.com/loritubukutalesibixazaz.pdf
    • http://timavutiziv.epizy.com/study_plan_for_phd_scholarship_in_china.pdf
    • http://wokobunowome.epizy.com/nihr_costing_template_secondary_care.pdf
    • http://junakaz.epizy.com/85475646514.pdf
    • http://rinubokuj.rf.gd/wojarejezetunin.pdf
    • http://gexijefepawu.epizy.com/retention_bonus_letter_template_australia.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_off000101ff.bin
b05ad3303cd6e6e921c26f8fda4259bef852567f4f6a464bc368745ea91ad2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 4988 bytes
font_01_sfnt_off0001130b.bin
1b370d2cad9aae2c56089968c72a4f81085d44397943d02ced1f15de6ffb0e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 11244 bytes

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