Malicious PDF — malware analysis report

Static analysis result for SHA-256 526d96a2c2f2af79…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 22:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4671bd6f4fe6205975647b50cf974152 SHA-1: 918d5daa54736805c7892077473cfd8bcf372729 SHA-256: 526d96a2c2f2af79d0edec7ae1063400ea93dc712f3b6cdd7bae5e302abae020
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is https://seumenha.ru/award?keyword=simplifying+algebraic+expressions+examples+pdf, suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://seumenha.ru/award?keyword=simplifying+algebraic+expressions+examples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488806/normal_604f624debb58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_6044f3bde8921.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/acls_2020_espaol.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/a_narrative_of_the_captivity_and_restoration_of_mary_rowlandson_sparknotes.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/sutinegepakif.pdfIn PDF document text
    • http://fajufoturesu.sportsontheweb.net/wafefiluponosabawa.pdfIn PDF document text
    • http://retoxen.mypressonline.com/91290872262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fd182bc90c83.pdfIn PDF document text
    • http://testrun.ru/my_little_pony_tails_of_equestria_pta0bj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_6041bc08cf5b2.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/outlook_365_user_guide.pdfIn PDF document text
    • http://blankid.ru/bootstrap_template_for_asp._net_websitesbokk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5ffbf9c9b5fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_60586a1d1ef2b.pdfIn PDF document text
    • http://molotkov.site/workshop_agenda_template_microsoft_wordtswwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_60140317ab626.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/comment_fusionner_deux_avec_adobe_reader.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/romogexezofif3ih2b.pdfIn PDF document text
    • http://indir-kazan.com/naruto_shippuden_episode_138_englishzp05g.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/southwest_premier_travel_insurance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwifubobu.epizy.com/fulozesiwopum.pdfIn PDF document text
    • http://wokeben.epizy.com/chrome_link_html.pdfIn PDF document text
    • http://didavinevago.epizy.com/difference_between_cdf_and.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/24293926397.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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 5888 bytes
SHA-256: ce49fda085bed639075847584502e92df66efd9cab7fac296dbfde3a512817dc
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 11992 bytes
SHA-256: 436dbd8e5a2a20d6d7da2006b34008836e9f3b7d5e5721da0883dd8881972980

Open this report in the interactive analyzer, or submit your own file for analysis.