Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9cc65044d49d77…

MALICIOUS

PDF

115.2 KB Created: 2021-03-23 05:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 107381bb98195b9bc52d8ee41a7ee307 SHA-1: 5379ea33b3eddbc31962a1f3b2efe40da6ca2bbc SHA-256: 3e9cc65044d49d77f398f76e777778298ef7e596bdd94a04117213b68513c3d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/award?keyword=data+structures+and+algorithm+analysis+in+c+4th+pdf PDF link annotation
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/putomumimuxew-nibefujezamivo.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/ge8ghMo/vikog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_6041ca5b98137.pdfIn PDF document text
    • http://reduslimitalia-official.site/ferusizisepoxedukekidojjpm9.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/24070674726.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/83391383976.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/RJuWq6G/rapanafenile.pdfIn PDF document text
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/b021bfd4536.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/20707025966.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5ff55e6ae4e78.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/6Lghjdl/mount_everest_base_camp_trek_guide.pdfIn PDF document text
    • http://reweder.site/how_long_to_learn_autocad_electricall9yly.pdfIn PDF document text
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/5937029.pdfIn PDF document text
    • https://cdn.sqhk.co/nonobepimaf/2Fjdidh/xoxib.pdfIn PDF document text
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/137acbdc14a.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/77737922610.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/decameron_giovanni_boccaccio_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gototura.myartsonline.com/ganapati_atharvashirsha_path.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/dialectical_behavior_therapy_techniques.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/digejiwedagiboxatibolum.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_off0001821e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1821E 5756 bytes
SHA-256: cf5af819f24c494c4a259ca54e0c2242b76e001473c9015e2a9d6e3bc7aeea5f
font_01_sfnt_off000195a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195A6 12024 bytes
SHA-256: 150b6331d3e97ff6a71a0d09bff8c76c442a7c518ac91f9979bdec1451e757a0

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