Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14884effe26699a…

MALICIOUS

PDF

78.6 KB Created: 2021-05-22 02:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1a702f6a422ad8d4f5f0f57df9cb9ec6 SHA-1: 289da77d99f14261665702f057190ae412083c79 SHA-256: f14884effe26699a690607ef021226f52d42f699e1bd19e676c604f16676e32a
176 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and multiple external links, including one to 'ponafet.ru/strik', suggesting it's designed to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF-specific exploit heuristics further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ponafet.ru/strik?utm_term=cambridge+english+business+higher+vocabulary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473618/normal_5fd95b47ea57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_606bdde54b5a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_601e887a80133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fecbeb688fc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_6038f1f3e5a5b.pdfIn PDF document text
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/757148a312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_604870f1c2c36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_6050498f1e79f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450511/normal_6005dc15a91d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_606cf3fca0dda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485929/normal_5fed2dab5b9ad.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/6e66122c0580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_605f7f4db5195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_60387d8552171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410448/normal_6002ea808d00d.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/votubukaxogilix/40520274287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8665e85e-d3e6-4f3c-b3d6-5d0e5ee45688/11766099399.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/majajeram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ef0024-3ca6-42bc-b7dd-09660319fae2/merchant_of_venice_workbook_answers_act_2_scene_7.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/random_variables_and_probability_distributions_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/bepixewafavulodojegijon.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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 5560 bytes
SHA-256: 6fcd5bae52eff9835dd523cb929c2d03c8142551bb8454770371c4f58d43e935
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 10660 bytes
SHA-256: b50db3787803e83b45ac27e5f6592e19a4e1505dfe93dfb007901f7df2c518d4

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