Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eda47134d00f73…

MALICIOUS

PDF

76.9 KB Created: 2021-02-24 19:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: aa24a94057fde7dc9efade2ca0f2f7d9 SHA-1: 5cd0db48b643a82ace97cab4609fda3764c0ec8f SHA-256: b4eda47134d00f73867d3120f2c19783c1679447de4b9081f2e67b666e42d2ce
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=how+to+go+to+pandaria PDF link annotation
    • https://cdn.sqhk.co/zivuzigup/PZjjk3x/pixel_gun_hack_apk.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/davumizenasarezutuw.pdfIn PDF document text
    • http://rubeparef.22web.org/fukusiwutadasogavuxe.pdfIn PDF document text
    • http://requiremcgood.com/short_batman_bedtime_storyvgszx.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/libro_de_urantia_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/fhjiajf/94119166885.pdfIn PDF document text
    • http://lovelyhouse.online/petta_audio_launch_videowuxbx.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/8RLmbGd/robot_fighting_2_minibots_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/K6ggijh/minecraft_earth_crafting_guide.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/8062269634eyvfm.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/gpyjghd/woteseta.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/how_to_work_a_dsc_alarm_system.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/jdhjpkc/tovubunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jokoligu.rf.gd/nilevuguxikexiloweda.pdfIn PDF document text
    • http://laxuraxosolun.epizy.com/rudra_cartoon_episode_14.pdfIn PDF document text
    • http://minefoz.rf.gd/is_greenworks_a_good_product.pdfIn PDF document text
    • http://wafidifu.rf.gd/dudotokazadoxuzulovol.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/22._how_many_chickens_would_it_take_to_kill_an_elephant.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 4640 bytes
SHA-256: 3b1f3d329df803469e3b9c8b43fc0b517eac8574d324bdb42f647ea622a821ce
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 10192 bytes
SHA-256: b95daccbe206d53c8388da5ca3daa6969039a9625ada8e637ba48103706ad401
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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