Malicious PDF — malware analysis report

Static analysis result for SHA-256 d231dfbc9c6f7408…

MALICIOUS

PDF

84.3 KB Created: 2021-05-17 08:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 50deb73b21e3154fb6b2e8b28880ce6c SHA-1: 2765d2190328270069637844d0dbbc42414e1104 SHA-256: d231dfbc9c6f7408d642186fffbad1c53da6e8d2cbc38459ecbc94500d8f18f2
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains or use UTM parameters for tracking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to drive traffic to potentially malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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=what+was+the+second+great+awakening+brainly PDF link annotation
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/zofiladuxejizeti.pdfIn PDF document text
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/16770.pdfIn PDF document text
    • http://helpverifybadges.com/jerijelafogononidisatojfr9f.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/sifabewurejijara.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/b7NYuig/60216448192.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/tzjcGet/subway_surfers_princess_runner_mod.pdfIn PDF document text
    • https://bibikabefome.weebly.com/uploads/1/3/5/3/135392895/98f5bfdd.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/xoxuwesozomi-bufobupelifuki-pugobajajumiv-kezamadatoxipu.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/KKdiIia/49740419358.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/ravipoxofixanudodjveat.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/g9Uihjc/breakout_racing_burn_out_racing_speeds.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/c1ffb.pdfIn PDF document text
    • http://wusapibixabupak.iblogger.org/29718228662.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/lasor.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jghjLia/38834496214.pdfIn PDF document text
    • https://banezinalirunod.weebly.com/uploads/1/3/1/4/131437453/bupeninurozi.pdfIn PDF document text
    • http://lidzadva.xyz/maine_guide_snowshoes_reviewuk0u4.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/kuxadenuwepu.pdfIn PDF document text
    • https://cdn.sqhk.co/tosemixuru/zUjiNic/11771263280.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/lisibodirigotatasoj.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/cBVU8j2/xonidas.pdfIn PDF document text
    • http://titujewegefo.iblogger.org/testi_canzoni_napoletane_classiche.pdfIn PDF document text
    • http://hhizmet.com/mesufivefesajavomonulajedejkye.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wanabovemuzume.rf.gd/steve_jobs_the_man_who_thought_different_chapter_6_summary.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_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 5612 bytes
SHA-256: cb3bc5e34f17eac8232fa755399b6f53bee27ce4bc8b31ab34d0c7dbfc45c19b
font_01_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 10448 bytes
SHA-256: c81a3224f8b3341563312239101a843349aa4e75adbb78a48721ed8d07341d63