Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e90f443d19baaf8…

MALICIOUS

PDF

71.4 KB Created: 2021-02-13 02:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b6dbd800c6b2aac943be0d7cdf2cfcfd SHA-1: 99f500bbc8e2066b4d7ed4d3a09e69c9fada1ea6 SHA-256: 8e90f443d19baaf861134db0f8e452452302161c0870ac1780f2ffd95475d633
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://seumenha.ru/123?utm_term=warband+character+creation PDF link annotation
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/ac5e33bffba2e.pdfIn PDF document text
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/gilolefe-dubonamaximi-viwumorutewoson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_6027170061aef.pdfIn PDF document text
    • http://rineset.xyz/kuvovinavigirotibv2dhj.pdfIn PDF document text
    • http://lazezubeb.22web.org/zofawesefotawakanim.pdfIn PDF document text
    • http://experiment.website/langrisser_landius_guideeo0my.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fd6505b1e028.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/ronewepefor_kesezuxake_fikewoz_fomixunajuroxid.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/multiply_and_divide_by_3_worksheetg44k2.pdfIn PDF document text
    • http://tukakesafaj.iblogger.org/bastar_university_time_table_2019.pdfIn PDF document text
    • http://shoop-ft.ru/548084964006f4xq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ff854600a4f2.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/mixanaz/internet_cafe_business_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/fraulein_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/saint_seiya_awakening_farming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/plant_systematics_phylogenetic.pdfIn PDF document text
    • http://gozadowosib.rf.gd/70461882510.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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 4972 bytes
SHA-256: 965c21660857ac7358769f265573f1e2abffea9c541694ec65f6da04124fefb7
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 10940 bytes
SHA-256: 1b2790515cea0b1fc3d144e15bed152bdfdbd8b1d4f5d227c5d9585bc508941e