Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ae7b52e4f25a8…

MALICIOUS

PDF

77.1 KB Created: 2021-02-04 13:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 4c05ad1b879af349e31807fabe9bfc6c SHA-1: 67df70ed809819e012548848c8dd6fcf8dd5afd7 SHA-256: 852ae7b52e4f25a84d20f2e438efe2bbeb5bbb78255fbf60547bed788796acc7
226 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/123?utm_term=instructions+for+amazon+fire+tv+cube PDF link annotation
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/kimiki.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/5rNnSG7/zutabalukeg.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/jhxQen7/56854860526.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5ff9c17da0087.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/ifCicjw/66940756099.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/LGbhfgc/cat_warrior_books_reading_level.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/e9c55dd.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/QgfihlR/universe_sandbox_free_online_play.pdfIn PDF document text
    • http://cccckkkkkdd.space/17183961455ndh53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5ffba5ee7c256.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/gghijJc/woodworking_apron_vs_tool_belt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepisaf.epizy.com/kajobogavozebasan.pdfIn PDF document text
    • http://nepanazunisemi.epizy.com/1589926785.pdfIn PDF document text
    • http://dibulazovila.rf.gd/46986359515.pdfIn PDF document text
    • http://suvumudupese.epizy.com/57711000811.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_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 5180 bytes
SHA-256: 15735b33a24292aea98dd8d34e3a8cea4b44f780f62a8f97ae9e7b5b561b2201
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10836 bytes
SHA-256: a3e658166a93a537b024052a31a6643dbf336269a66627140c02d0a3ab9bf164

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