Malicious PDF — malware analysis report

Static analysis result for SHA-256 99faca03ed39cc07…

MALICIOUS

PDF

61.5 KB Created: 2020-12-17 15:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eb24c5cec550909873f95f339aaf541 SHA-1: d364365cf6333e0e1cc39f577cf733b66531dbc3 SHA-256: 99faca03ed39cc07369979ba8cc7c35016036511c7e1254d136f0171bde9eb98
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to 'trafftec.ru', suggesting a link farm used for phishing or malware distribution. The presence of embedded PDF objects and the 'wkhtmltopdf' authoring application further support its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=joseph+j+catena+lunch+menu
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/fijakiwedu_zuwused_pejaninafifexo.pdf
    • https://wetewiduwolenit.weebly.com/uploads/1/3/4/5/134599830/f3715eba0cee2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vetamedisoz/60422619270.pdf
    • https://static1.squarespace.com/static/5fc7bc0302915d4a16fa7057/t/5fd6d153df2f0204c2473f5a/1607913813939/sincronizar_calendario_google_android.pdf
    • https://uploads.strikinglycdn.com/files/2bf5ecc3-41c6-46f1-bd39-106c46dd5a4a/vogokiranuze.pdf
    • https://s3.amazonaws.com/woxotopapozokev/kdigo_transplant_guidelines_2012.pdf
    • https://s3.amazonaws.com/wixamupelinere/fractals_in_molecular_biophysics.pdf
    • https://s3.amazonaws.com/fizufapu/campo_alegre_curacao_from_cruise_port.pdf
    • https://static1.squarespace.com/static/5fc5936eaffbf90a660a4a03/t/5fd75ace7fc52c206942c020/1607949006796/zinemanezadeko.pdf
    • https://s3.amazonaws.com/paxivogedewilu/java_runtime_environment__jre_64-_bit.pdf
    • https://static1.squarespace.com/static/5fce68051d9e1221b03c5dec/t/5fd1e4238185f4776a0fd4f8/1607590948981/best_black_friday_tv_deals_2019_target.pdf
    • https://s3.amazonaws.com/dugibabafod/apa_formatting_paper_title_page.pdf
    • https://s3.amazonaws.com/fejififimaketo/mouse_toggle_for_android_tv_apk.pdf
    • https://s3.amazonaws.com/wemupajese/fitekitesizutemobod.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_off0000b314.bin
a4050cea4bad55dfc84aeb7c04aa17769c37dd1b4aa308c3efa0fe6ff0c4b553
pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 5144 bytes
font_01_sfnt_off0000c470.bin
4fde527b3623af8b291a12f02344af15520bca0a8529f66bd732c5d661af2b48
pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 10792 bytes