Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ad4c964bd668bf…

MALICIOUS

PDF

152.6 KB Created: 2021-04-24 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 37ee946afe9fd3eb87eb32da97f56e47 SHA-1: ca68161351403a221ff8a6d95abe552d2bb3bf0a SHA-256: 20ad4c964bd668bf6ca7a3aa9e44fc76ed48a79c92cd4b8eb862ccc50980915a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=medios+de+comunicacion+san+miguel+el+salvador PDF link annotation
    • https://cdn.sqhk.co/vipujitebiki/jhahaif/shadow_fight_2_weapons.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/djbjjjf/imf_grant_fox_news.pdfIn PDF document text
    • https://pifodepap.weebly.com/uploads/1/3/4/2/134235937/nuwubesuzune-porobudubus-xowepixewu-jideri.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/gufabinosupi.pdfIn PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/2956094.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/D2Bib7L/rise_of_kingdoms_city_hall_upgrade_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/BTThhii/teacher_planner_and_markbook.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/70933399638.pdfIn PDF document text
    • https://cdn.sqhk.co/jasolizilaf/jbjcsii/lego_marvel_superheroes_cheats_ps3_invincibility.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/jmr6Whb/27806255167.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/Mjegcgi/princess_marathon_outfits.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/ieMfN2g/amazon_music_vs_spotify.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/DjihZLE/kerurawovimese.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/d3a2145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidusagi.atwebpages.com/good_and_bad_habits_esl.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_212b581004b94b0783ef50a349f1c19c.pdf?index=trueIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_31699851196f418bbc727590e3318bc8.pdf?index=trueIn 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_off00021b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B52 5324 bytes
SHA-256: e5756d4e104832ff2a54f0db9aa6af8780c3f08f5e1cc9494c106a46b75888ab
font_01_sfnt_off00022d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D69 11940 bytes
SHA-256: 2ef1f9480e6526cf8a38423a5cf2ce828252100db2207c1ed843f5d59591d3a2

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