Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c67deb0f19785b6…

MALICIOUS

PDF

65.4 KB Created: 2020-11-14 19:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56d1f7c799ef23e51576fb6b39955b33 SHA-1: db17140b2e7525fa878ab6f785d37ab75f54f66e SHA-256: 6c67deb0f19785b61c4e272a5a8c6b4a65a27fa0b8ca84f03f23e5365db39235
214 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 and routes users through malicious redirector infrastructure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=science+citation+report+2018 In PDF document text
    • https://revamimetanezoj.weebly.com/uploads/1/3/4/5/134597499/4d9c8ca1.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/joxabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5faf6febcf311.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/pirosisob/ribuwanudajene.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/memphis_weather_forecast_13.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/77640568494.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/79392425991.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/33907397525.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/is_sociology_a_science_debate.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/wiwodosukuwonazafeleluba.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/fake_steam_gift_card_generator.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_off0000c16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16E 5340 bytes
SHA-256: 7ab473dc90bdbef78666f7daeb51ece1b7980eb34d0c2ee2be3e78ef41c8fbe2
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 10656 bytes
SHA-256: e29b917139dcf7cda0cf7491cff3216ac59bf279a5036cc091d0bebef3fc0f59

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