Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b75330b756a4377…

MALICIOUS

PDF

77.5 KB Created: 2021-03-09 02:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e7758ae1a0923ae7b1a8f5445dfbbf47 SHA-1: 5079c76ff17f3e28bd28c13dc8d6e936a535adb7 SHA-256: 4b75330b756a437757c0df14dfbb6d228941400c73fea69f57a24fa5aac68c12
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector to known malicious infrastructure. The embedded URLs, such as 'https://crophysi.ru/wix?keyword=2003+subaru+forester+manual+transmission+for+sale', are indicative of a phishing or scam lure, likely part of an SEO poisoning campaign. While no scripts were explicitly extracted, the nature of the PDF and its links strongly suggests it's designed to lead users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=2003+subaru+forester+manual+transmission+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fda0817cdc14.pdfIn PDF document text
    • http://tameenegypt.com/how_much_do_reiki_healers_makemols8.pdfIn PDF document text
    • http://maska-respirator.shop/professional_nails_done_at_home_near_me3j94q.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/jbqggjg/grand_floridian_concierge_phone_number.pdfIn PDF document text
    • http://bitsracing.net/iso_7810_cardy4hft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_5fcec0c552876.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/if2sxaR/first_world_war_history_in_tamil_video_download.pdfIn PDF document text
    • http://grafoanaliz.ru/63029875978xxgio.pdfIn PDF document text
    • http://reduslim-sito.site/2899312666166u8n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_6013371e53549.pdfIn PDF document text
    • http://leyloften.online/motu_aur_patlu_ki_jodi_cartooniute0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_602405311629e.pdfIn PDF document text
    • http://civiliscmq.online/960315743191wkw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_6034c6ca1a5f5.pdfIn PDF document text
    • http://dress-russia.ru/download_game_furious_drag_mod_apkpzcer.pdfIn PDF document text
    • http://tameenegypt.com/92411568754k2f1s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11acfe6-0434-4b1f-84f9-d0f8a37fbbca/fobabaxebeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a8479e-29ea-4509-9d53-45631207c53a/58495404119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c69b86e-ee90-40da-83f3-505cd0790c0f/chinese_symbol_for_adventure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee11191d-4e70-4fc1-b4c1-cac71fab4286/maxi_cosi_mico_ap_2.0_compatible_strollers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b166b6cc-70ed-49a2-9fb3-75a180a272c1/savajumej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b0fa04-ee89-48fb-8fad-8d7b3aab7848/institucion_general_del_misal_romano_tercera_edicion_tipica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f209d2-edbc-4f18-919c-c32397f92e36/tejebupa.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_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 5396 bytes
SHA-256: bb6382c70afcc95820430a6e352452aa6131c6f3078f4e4b8b2c4308e5e7006e
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 9904 bytes
SHA-256: e72244695351b3100013a489322321d8a1b41572ed3713934b1fca6a7dc597bf