Malicious PDF — malware analysis report

Static analysis result for SHA-256 55461e9b119971c5…

MALICIOUS

PDF

78.4 KB Created: 2021-04-25 01:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 042bb0ba88c50cd094a3da1dc75e8d81 SHA-1: 20b4cf9901c0cff65336d6c2014079a9cf36cf18 SHA-256: 55461e9b119971c5476d8e83e1217b698950cbf49c844f4febcda5f76db486df
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly suggest malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=casio+wave+ceptor+4756+battery+replacement PDF link annotation
    • https://cdn.sqhk.co/dewavasese/a2fJsij/sky_movie_tv_guide_today.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/haHhgjL/zoning_ordinance_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/ibhdFFu/kavupoxozoxogebowavon.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/jjShcja/rdr2_companion_app_map_disabled.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/hcjaygi/9462617369.pdfIn PDF document text
    • http://lestyprin.online/672855932835u2cu.pdfIn PDF document text
    • http://gprofights.ru/adding_and_subtracting_fractions_2_answersdakxl.pdfIn PDF document text
    • https://cdn.sqhk.co/visevunu/ikhhieu/angry_birds_full_movie_in_tamilyogi.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/hiUnjiM/world_builder_games_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/egasgpU/espn_nba_scores_nfl.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/english_test_present_and_past_tenses.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/bUfU1hj/sims_4_superhero_mods_2019_clothes.pdfIn PDF document text
    • http://denizan.com/96736874347olctl.pdfIn PDF document text
    • http://urolog.xyz/international_marketing_plan_of_nestlev9tud.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/b078c496-d0ed-424a-882b-79441016bd40/o_come_to_the_altar_elevation_worship_ukulele_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f33f7a-10d3-4aaa-9cc1-4c40b9e01b2e/88698766966.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_b6c50bc5e84f4c769653ce56329f4d80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d47b28-3b5d-4773-9021-4d40e1fe5d32/arrl_general_class_license.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/9225340622.pdfIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_eaa6b3e9fcf2476d88cb6c7bb6a39f26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83776b1-3fbc-4cf2-a3d9-d636fff170b8/vuzorud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a408da4-b5ef-4484-96c8-f2f457dd2e12/hoover_carpet_cleaner_parts_fh50150.pdfIn PDF document text
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_9206623c05444298a59ef6916b3e3bbe.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_d06a0cee62ae476e9dbc5fc75a5c085f.pdf?index=trueIn 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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 5824 bytes
SHA-256: 34e8dd99692a2ec3bb6bd9735cfea933cc4622290f6e2ebd6e0505b7c3406f51
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 10844 bytes
SHA-256: 439fa2589a2f686695effe23ea015c140654326e30f1c59638bfe12f59049cc2