Malicious PDF — malware analysis report

Static analysis result for SHA-256 f212ace9ebb0fc8b…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 22:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74ea21f8587cc1668bcec065bbc9783 SHA-1: 73352b29aa82e93e08a5c9a83b6337314f252cf5 SHA-256: f212ace9ebb0fc8bd4dea744dbc003e247676f801873f0f7d716782c4ed06713
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/strik?utm_term=is+fe3%252B+to+fe2%252B+oxidation+or+reduction
    • https://cdn.sqhk.co/vilubofi/jigfiey/zamemaxukika.pdf
    • https://static.s123-cdn-static.com/uploads/4449399/normal_5fcf05808a872.pdf
    • http://cheeronthemove.store/2006_honda_civic_ex_coupe_horsepower28ej1.pdf
    • http://uaportal.site/57768768962p6q01.pdf
    • https://cdn-cms.f-static.net/uploads/4412382/normal_60318a9dbba1f.pdf
    • http://imm-shoes2.club/automatic_reply_leave_templatecy83e.pdf
    • https://static.s123-cdn-static.com/uploads/4419235/normal_5ff7ba451fe1f.pdf
    • https://cdn.sqhk.co/fajaleniwa/gcGhjrk/make_money_online_earn_cash_app.pdf
    • https://static.s123-cdn-static.com/uploads/4385633/normal_5fdf9a5d82587.pdf
    • https://cdn.sqhk.co/xemugugafot/jjYb8ia/29895564065.pdf
    • https://cdn.sqhk.co/zezinojox/cMdiegc/exoskeleton_meaning_in_biology.pdf
    • http://realnoe-obshenie.online/wasanorofewubawoxamolas43k0.pdf
    • https://cdn.sqhk.co/bizewavaxug/iGz3Uhh/18218834730.pdf
    • http://alternativeinfluencenetwork.net/is_charlie_and_chocolate_factory_on_netflixhflse.pdf
    • https://cdn-cms.f-static.net/uploads/4458390/normal_606128d75f195.pdf
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5fe09f3ee07c3.pdf
    • http://realnoe-ob
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_5dd69d04e2db4365b295ada5ee0b4bdc.pdf?index=true
    • https://s3.amazonaws.com/gazitif/couple_goals_pictures.pdf
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_269751678e644d1ea213fb2e9fdb8bd8.pdf?index=true
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_0589b4441288478d8cad2838b45dcc13.pdf?index=true
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_a29659047b784b21b941ad8b76fdc613.pdf?index=true
    • https://s3.amazonaws.com/mokixetat/munadetat.pdf
    • https://s3.amazonaws.com/rixevozajixezos/togito.pdf
    • https://s3.amazonaws.com/fuvidokibet/navizafafozevuditide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f1.bin
a4ca01fba1ef13e945c90696aa85e17d659da4fabdcab3c2445c42826428d857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 5284 bytes
font_01_sfnt_off000105fd.bin
1ec5370a9eed831bf6eb07ad2f786758f739113825682131d23fb545b431f5d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 11076 bytes

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