Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c104e49aea1e23…

MALICIOUS

PDF

70.2 KB Created: 2020-11-11 17:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a457125f7e133de1420996b4b0c7bf93 SHA-1: 6323f07e1fd8ca02e57d6a329a2b247d9510a121 SHA-256: 93c104e49aea1e23e625e80e5264eb0563eee3e25056a741ea6ae41a13f17fe5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://traffking.ru/strik?utm_term=texto+liter%25C3%25A1rio+e+n%25C3%25A3o+liter%25C3%25A1rio+exerc%25C3%25ADcios+com+gabarito PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f91c545ce4d5.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/1991655.pdfIn PDF document text
    • https://murenazomof.weebly.com/uploads/1/3/4/0/134012525/59ea0ebac.pdfIn PDF document text
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/soxojajenup.pdfIn PDF document text
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/85e27.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/netinuwa/half_orc_fighter.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/html_css_color_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/35865523488.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/update_android_apps_manually.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/nigel.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/billboard_bluetooth_headphones_wont_connect.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_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 5884 bytes
SHA-256: d53075da344925e0a7028016b900a95c7a2f65aa87d39cf01d0ce39a7271c545
font_01_sfnt_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 13820 bytes
SHA-256: 25968a869140d02dec41229e1d7f2e7d092bdda3d0dbe786ca42e2017ff8cb03

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