Malicious PDF — malware analysis report

Static analysis result for SHA-256 24496fe9c79934bf…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 23:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aba889de06c5ad5e755834516bc5bd04 SHA-1: 06d5178538e14ef4747d30d5e195eab76b548803 SHA-256: 24496fe9c79934bf2177f2ffeceb4403aed78bac71d51c32628bf8dac9125961
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=best+3d+chess+game+for+pc PDF link annotation
    • http://nitanupemil.mygamesonline.org/rxp_gtn_750_manual.pdfIn PDF document text
    • http://online-bestshop.xyz/swann_security_camera_extension_cable_bnc5uthn.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/9652913.pdfIn PDF document text
    • https://xotizirew.weebly.com/uploads/1/3/1/8/131855992/fagotagetawunu.pdfIn PDF document text
    • https://jobifavizatop.weebly.com/uploads/1/3/4/1/134108852/7922499.pdfIn PDF document text
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/676d37acc1827.pdfIn PDF document text
    • http://begetus11ppz.xyz/how_do_i_reset_my_amazon_kindle_fire_to_factory_settings2oqxl.pdfIn PDF document text
    • http://geniusenglish.space/best_cv_template_online_freeee3a5.pdfIn PDF document text
    • https://memagakotis.weebly.com/uploads/1/3/4/7/134760483/3467124.pdfIn PDF document text
    • https://lixebofupasiwik.weebly.com/uploads/1/3/2/3/132303312/8462490.pdfIn PDF document text
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/sitaxip.pdfIn PDF document text
    • https://zipezeroluxufa.weebly.com/uploads/1/3/4/9/134904793/9832718.pdfIn PDF document text
    • https://jeradowekijulu.weebly.com/uploads/1/3/0/7/130739924/585e23ea1047c68.pdfIn PDF document text
    • http://gufutaca3.xyz/accident_reports_nc_state_highway_patrolr8kmw.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/8b17d10cc1454.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://nopuxawox.epizy.com/hair_cutting_set_for_sale.pdfIn PDF document text
    • http://jeburam.epizy.com/malayalam_movies_collection_movie_moviesda_isaimini.pdfIn PDF document text
    • http://nufurezoguboli.epizy.com/what_is_a_bell_jar_definition.pdfIn PDF document text
    • http://nivosifif.rf.gd/77161760630.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/present_perfect_definition_and_examples.pdfIn PDF document text
    • http://gedanenek.epizy.com/checkpoint_5600_firewall_datasheet.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_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 5384 bytes
SHA-256: 5ca2b0259333fc84a19f63f69afadfac00b22fc78fb74fc26f0a4ba07ebd17ed
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 10916 bytes
SHA-256: 9621300678adb5a565ec8fa98e0ed66a938da502be423bee2d3fa15f3f398c65
font_02_sfnt_off00012f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3