Malicious PDF — malware analysis report

Static analysis result for SHA-256 21986dc1f64ced52…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 17:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e24a7760a15fc578747cab15afbee8d4 SHA-1: 13988b390ec75fdbbf084e87be02deb28594b004 SHA-256: 21986dc1f64ced526e620e4c9cdb3fb88f222d5b24df10080ced93e20dcb136e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('zajinet.ru' and 'madokedaxemosu.22web.org'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=shrek+children%2527s+book
    • http://madokedaxemosu.22web.org/50452632434.pdf
    • http://nazorizuz.medianewsonline.com/what_to_say_to_a_woman_diagnosed_with_breast_cancer.pdf
    • http://sijemogezabusa.sportsontheweb.net/indian_veg_fast_food_menu_list.pdf
    • http://mozovurezet.iblogger.org/bevonetevuzowuxatiruzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_17e43711a4bd43869831213c15853cb2.pdf?index=true
    • https://s3.amazonaws.com/mokuwanibof/vcenter_6._5_vmdk.pdf
    • http://tonorepunad.myartsonline.com/1050427049.pdf
    • http://zeroxezubanalil.onlinewebshop.net/propiedades_fisicas_quimicas_y_biologicas_de_los_materiales_dentales.pdf
    • https://uploads.strikinglycdn.com/files/6e906d04-5acc-49d0-afb5-4d5eba47db34/how_to_write_a_senior_farewell_speech.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_aca6cab99eb84527803b5ad3836f65d4.pdf?index=true
    • https://s3.amazonaws.com/difigomisosak/command_prompt_for_android_free.pdf
    • http://xonolori.atwebpages.com/konadisazux.pdf
    • http://jivupiputugafi.epizy.com/77460438586.pdf
    • http://jenigaseze.epizy.com/relational_algebra_cheat_sheet.pdf
    • http://bujidijig.rf.gd/all_above_information_is_correct.pdf
    • https://s3.amazonaws.com/luropi/bafg_erklrung_zusatzblatt_zum_formblatt_1.pdf
    • https://uploads.strikinglycdn.com/files/8bd05ec9-8bac-4ef6-934a-b63a9d6faf32/61601793215.pdf
    • https://s3.amazonaws.com/gizonukorad/hayabusa_bike_images_free.pdf
    • http://naxesabefadufu.atwebpages.com/davunoxavapelupis.pdf
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_34e93eb7ad0043ea88e1370e6ace3577.pdf?index=true
    • https://s3.amazonaws.com/fifomi/ardamax_keylogger_4._5._1.pdf
    • https://uploads.strikinglycdn.com/files/b7f9e944-3af5-4e91-8723-e795763d9a3a/zifur.pdf
    • http://bodegifu.atwebpages.com/quality_management_certification_for_nurses.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_off0000f8a9.bin
58ef2ae341f87402be6ef58356c1e16158189692828bb78c0f1b147c654aaa4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 5156 bytes
font_01_sfnt_off00010a2e.bin
ec43eb3b5dfc0b7c1f43c060071e54b928b6d208d8c447f5a8e543d1b688611a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 11508 bytes

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