Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cf56f314ce413d…

MALICIOUS

PDF

78.4 KB Created: 2021-02-14 10:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 536b64cccabfecb5ca73e1cf8fde29cf SHA-1: 9167c7e63f01ee2fd89ae052652c4c28d8ef6df2 SHA-256: d5cf56f314ce413d154b4460a0d546117355651723e494b2ea695bae049026d1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://baarspo.ru/wix?keyword=canyon+guide+clothing', is flagged as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/wix?keyword=canyon+guide+clothing PDF link annotation
    • http://tuwuviji.iblogger.org/31936349581.pdfIn PDF document text
    • http://puxuxin.22web.org/converting_fractions_to_decimals_worksheet.pdfIn PDF document text
    • https://goladamopalej.weebly.com/uploads/1/3/1/3/131397974/vanizeluzis-jobebototunag-kiwobaw.pdfIn PDF document text
    • http://nazawate.iblogger.org/asus_bios_update_utility_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jdHbhgZ/tupejejejifupag.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/vetelepusa_pofifivavu_kenow.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/hjdkicN/tukekesuruwojaxape.pdfIn PDF document text
    • https://nakafafokebupop.weebly.com/uploads/1/3/1/4/131437029/bopekuwolesonalumofu.pdfIn PDF document text
    • https://cdn.sqhk.co/sukeseram/dQjguAy/doresibeke.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/lemaluba-xifis.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/dojivewobasuval/voziwadusogitutoxefilawu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/42544554711.pdfIn PDF document text
    • http://sebipukavore.epizy.com/3874360961.pdfIn PDF document text
    • http://polexunew.epizy.com/79458921723.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/telecharger_clavier_android_azerty_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/formal_letter_for_job_appointment.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/mutixukikowileguza.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 4936 bytes
SHA-256: a2022b1e30f44a332c212de9b555a71b50448d6086b5256914de9edb2951d975
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 15564 bytes
SHA-256: 0c2d47268bf182363041c3831c10c362993dd57d7ab97538635c833280395780

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