Malicious PDF — malware analysis report

Static analysis result for SHA-256 33869c57584f6a2b…

MALICIOUS

PDF

76.8 KB Created: 2021-04-03 07:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7807a961428754724c16968e7772f37e SHA-1: 5a38f82d465b25c39ee889724edf29d65767cba8 SHA-256: 33869c57584f6a2be594e589ffce9888b1b8262bc7db0ff53f26838e8537b97a
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://pelibifir.ru/award?keyword=paired+conjunctions+exercises+with+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5fc5abbd87f22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451228/normal_5fe3531a6e4a3.pdfIn PDF document text
    • https://cdn.sqhk.co/videmixolute/mZ5kCz8/let_s_talk_about_hobbies_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/4kD8ZQV/bimogujik.pdfIn PDF document text
    • http://cadenalia.com/dexisuregagufi72hlp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_600c26ecc142e.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/7888563.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/KhgiaNJ/13789988459.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/lafodolodudajolob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6050d9d8e98c5.pdfIn PDF document text
    • https://cdn.sqhk.co/motuxeneb/DMhjghj/royal_robots_battleground_mod.pdfIn PDF document text
    • http://mpvideo.org/asclepius_wellness_product_list0hfzs.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/geradi/dyson_-_ball_animal_bagless_upright_vacuum_-_iron_purple.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/html_responsive_template_for_education.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/50637989525.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/ipcc_report_ocean_and_cryosphere.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/90730339620.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/how_to_reset_tp_link_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/nenumul.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/sedibubuma.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/93755228807.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_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 5448 bytes
SHA-256: 5eea2aaf8f5eac52606b005f8764f6e21269ea34c2fade6e05069bff5f9bdcfc
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10636 bytes
SHA-256: 83fcc016d6688fc5795486174468c69a50151f365753feffbabf796335b96b68

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