Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ae3e7010f70d41…

MALICIOUS

PDF

76.5 KB Created: 2021-02-25 16:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a9de168c862b05df1871fb7613259f12 SHA-1: d1d3a7f23c2fa93dfd7c7797d58d46fc25c60483 SHA-256: e5ae3e7010f70d41b6b421a67fdd33b26a685695c05d1778b7e742292040a557
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable or redirector infrastructure. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=yuval+noah+harari+guardian+review In PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/czihcjb/gajiwutezesikevigufekisuw.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/iiLimhg/84884174538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5fef102b97c04.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/zemuz.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iTvXjcy/descargar_apk_de_geometry_dash_world_full_version.pdfIn PDF document text
    • http://zespodsvetkoy.site/voltage_drop_calculator_3_phasexuhl2.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/ieicjgE/bubble_boy_poker_meaning.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/26f0815.pdfIn PDF document text
    • https://medabuxizuf.weebly.com/uploads/1/3/4/3/134383904/vumapow.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/venstar_t2900_blank_screen.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/dumujezila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5fd5f48e82db9.pdfIn PDF document text
    • http://bonus332.site/jipuraxonizazesopbmdal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5fc5e0d0c8cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_60297c9a860a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fd30780ad347.pdfIn PDF document text
    • http://phulop.store/rotelazinarixozubuxaocug6.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/what_is_the_white_queen_based_on.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fcbcab86122e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fef7c47f3d41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447649/normal_5fc665f37eae5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 5024 bytes
SHA-256: 6aa40276b73f87e8b57b4bd5dd2cc5ee32e415029dca91b8ed73486f61effabe
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 11280 bytes
SHA-256: d7a63448ec3cbeceea167c4a6d71315606d2ae1f01f1bef05d77636b7b834c03