Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c683adbce0f38c…

MALICIOUS

PDF

68.7 KB Created: 2020-11-12 20:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 25740dfd2649ceb225b2d678c7825203 SHA-1: d6418f863a4e85a644a1bdfff8e719d73fc6e9cf SHA-256: f4c683adbce0f38cb5bce53fa6db4653e21ec50f1f64eba3f5322d32a5d299fe
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafficel.ru/123?utm_term=ba+gua+zhang+near+me PDF link annotation
    • https://repavubujog.weebly.com/uploads/1/3/4/4/134486674/sizibalimepiv.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/0cb5d3d9.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/henghuili-files2/pukopu.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/cnusd_calendar_2020-21.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/ithaca_town_court.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/besm_d20_revised_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/digital_to_analog_conversion_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/43942022795.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/bcc_mail_manager_full_service.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/kenawotuwizibifelumogubu.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/58083268633.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/speed_and_velocity_worksheet.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_off0000ce93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE93 4988 bytes
SHA-256: 14aa2fc1f6cab676f0c9c0ef0820ae375f897847c64f0826a6d440b3a609c82e
font_01_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 11256 bytes
SHA-256: beb9320de9b279ecea11ab10ff71f4d940027cb9f9b8691f42eac8178f1ddba2

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