Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea663d052ce79728…

MALICIOUS

PDF

152.6 KB Created: 2021-03-18 08:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b134ae34979df18c126d4b2f0c1fc597 SHA-1: daf80995dd45437b14ccd7d869c819fd758cdb2e SHA-256: ea663d052ce7972818604512a29b0210b343a3452f98b25aaffbb8ecaf739e2d
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains, and is flagged by heuristics as a link farm and a phishing/malicious PDF. The primary URL, 'https://druttle.ru/wix?keyword=instagram.special.wp+followers+generator', suggests a lure for a fake service. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely to redirect users to a malicious or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=instagram.special.wp+followers+generator
    • https://static.s123-cdn-static.com/uploads/4416326/normal_5ff7f2a5444fb.pdf
    • https://cdn-cms.f-static.net/uploads/4374685/normal_6026183ab8041.pdf
    • http://jetotujaj.iblogger.org/electrical_engineering_jobs_in_indiana.pdf
    • https://cdn-cms.f-static.net/uploads/4472216/normal_604f40b473798.pdf
    • http://topijakalez.22web.org/sudizinabukuxo.pdf
    • http://feelslike35.com/distribucion_hipergeometrica_ejercicpc6iv.pdf
    • http://tejasatobes.medianewsonline.com/anti_asthmatic_agents.pdf
    • http://shopmzm.site/viruluxorx4rb.pdf
    • http://gixapedotamerow.mywebcommunity.org/guvirazametavemimileraven.pdf
    • https://static.s123-cdn-static.com/uploads/4393515/normal_5ff5c7fb619e0.pdf
    • https://cdn-cms.f-static.net/uploads/4374685/normal_603c79690d858.pdf
    • http://sopisafexuj.sportsontheweb.net/konsep_kurikulum_pendidikan_islam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lopaxoreje.rf.gd/puvudix.pdf
    • http://debubiduselez.epizy.com/5_love_languages_by_gary_chapman_summary.pdf
    • http://tutunod.epizy.com/medical_bacteriology_notes.pdf
    • http://mubomapobe.epizy.com/vafipozilu.pdf
    • http://solarujarinobo.myartsonline.com/3d_to_step_online_free.pdf
    • http://petetilazuji.epizy.com/lijesuvixodaxezepokilejel.pdf
    • http://bevevekafoli.epizy.com/53935091197.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f924.bin
47d981e0e8036c39cdc1903258bbd29131850bc78a7ae6df1744c0ac97261d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 95016 bytes
font_01_sfnt_off0002148d.bin
3e7aac62fe854516592f8f5ecd357860a954da882efdd481d432dab6d28c6b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2148D 5396 bytes
font_02_sfnt_off000226ed.bin
0c3d53811b32fb8994dece6a6deb7cbad786c2059668448ab4f87be345cc6fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x226ED 14084 bytes

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