Malicious PDF — malware analysis report

Static analysis result for SHA-256 e511a624b24d7642…

MALICIOUS

PDF

70.0 KB Created: 2021-02-06 13:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: afd0ee9a3b801e03b637d64ee52e8e1c SHA-1: ba095fa7965253ca76162448d3e02dc1c7fa3c47 SHA-256: e511a624b24d76425add7c37b1d380f4c65ef0d654a2b6ad048694629771aadd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics indicates the document contains numerous external links, with one pointing to 'https://maypoin.ru/123'. The SE_INVOICE_LURE and SE_CALLBACK_LURE heuristics suggest the document's content is designed to trick the user into clicking these links, possibly for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://maypoin.ru/123?utm_term=wash+wax+all+mop+head PDF link annotation
    • http://segway-wheelchair.ru/angularjs_programs_for_beginners7q6zs.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/dimogurekorizep.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/3c4da4bcf.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/xumigoxal-kepozoraja-jofamepefadanem-xiwakurijimit.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/ruvosemudujivirigani.pdfIn PDF document text
    • http://specrazreshenie.com/6855962321nwjn4.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/tokit/16247941713.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/truecaller_app_free_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/phenol_chloroform_extraction_phase_inversion.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/commerce_department_steel_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/rudosanezawiwuxeze.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/domegumij.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/erp_loyola_college_online_attendance_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/parallel_and_perpendicular_lines_worksheet_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/surevin.pdfIn PDF document text
    • http://xevivalekivo.epizy.com/buzizitet.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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 5276 bytes
SHA-256: 466f504ca8d0976f463b232f23fc96cf2d006038db18d5123fbd7731c89d7a98
font_01_sfnt_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 11712 bytes
SHA-256: 2b282a624bcc8ff51db23a3ce428641a67fe2c8d49ded16ba3a66ee29788a825

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