Malicious PDF — malware analysis report

Static analysis result for SHA-256 50911ee3595d9138…

MALICIOUS

PDF

87.0 KB Created: 2021-04-03 08:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a1037bf9efc62ee4449593ec6a5f411 SHA-1: c4f002801b498e1ee31975f106b1fb5b3cc285f6 SHA-256: 50911ee3595d91381b41272812a54edf144148d7001a657469a0ed1319e9f2fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The primary URL, 'https://leonvi.ru/strik?utm_term=how+to+pronounce+ariel+from+the+little+mermaid', suggests a phishing or scam attempt by luring users with a seemingly innocuous search query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=how+to+pronounce+ariel+from+the+little+mermaid PDF link annotation
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/xagudugak.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/9hjW1tQ/92882954794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_60570ea819c62.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/ed7794fb1a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fd97bb5a7fca.pdfIn PDF document text
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/surenokizavu_bowipus_soses.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/xiwokokotezetorenosimew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5ff5c17f5b52a.pdfIn PDF document text
    • https://sanevofodi.weebly.com/uploads/1/3/0/9/130969150/f6e1540a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_6009680a56817.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/413109573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_6046a08d469c3.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/toxujoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_6033f56465c00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5feb452499ec3.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/Dih2Hig/game_crazy_zombie_2._9.pdfIn PDF document text
    • http://delojenopow.66ghz.com/boy_scouts_whittling_chip_card.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_6036d883d7e97.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/dell_precision_m4500_launch_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limufewugewo.rf.gd/waves_physics_book.pdfIn PDF document text
    • http://widopux.epizy.com/islamorada_fishing_report_march_2019.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 5272 bytes
SHA-256: fc89b49c88c47abf71ae7271c939b5e93e18a5cf59c541991e12272698092c35
font_01_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 11860 bytes
SHA-256: c63d656da04c9e823dea27a34d4725d8bbf55025455b86c4f79aeecc5378a0df

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