Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b58c495e076e88a…

MALICIOUS

PDF

87.6 KB Created: 2021-03-24 17:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2d958b90466b9ea453653f412e990eb2 SHA-1: 5c5d8d5f0ce5fae4ee63a8a72b3d40713b10ff52 SHA-256: 8b58c495e076e88a54fba2a3ec616bc0f7967b021ecf0df8442100120cc9a759
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bologen.ru/123?utm_term=messenger+for+iphone+5c PDF link annotation
    • http://palaxofivuleduj.medianewsonline.com/intrinsic_and_extrinsic_pathway_of_apoptosis.pdfIn PDF document text
    • http://impergamon.com/singer_simple_sewing_machine_troubleshootingckjui.pdfIn PDF document text
    • http://uscreditcheck.info/boonville_daily_news_police_reportsuwpfu.pdfIn PDF document text
    • http://plafond.xyz/39716589540qyig7.pdfIn PDF document text
    • http://smartcreditcheck.info/keystone_8mm_projector_model_k-108i4c9v.pdfIn PDF document text
    • http://bigops.fun/black_and_decker_coffee_maker_12_cup_walmartc1y6r.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/ba84176d-351e-4c51-a297-7bbc63edf842/how_many_volumes_in_berserk_deluxe_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff67b48-10a8-4263-b1a5-53401efaa2ae/how_to_change_brakes_on_ezgo_golf_cart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5b2485-e00f-474b-bce7-92e6add6bfbe/organizational_theory_and_design_11th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e22aab-ad32-4bdb-b18f-08c8568e3eb7/vekafumaxudop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5da5fb-b560-4996-ae37-cfb81bae15e4/hp_envy_4500_refill_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/wurinidafekiwudeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabba25e-8c4c-48f6-9add-e2facbf18bb6/world_stock_markets_live_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27389c8-72ff-4fb5-9511-9f532d3e913b/usps_can_i_stop_return_to_sender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9300d073-5a98-4723-a50b-08d02402a9fd/47399517557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529b7d87-87a1-4eef-90d3-a84141cbfbd8/cen_tech_battery_charger_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/mezilimegalakiduvof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de51d94-751a-4e95-9fa4-cbf3d08925f5/88918097793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc41148-2917-469f-9cd3-09dac187b396/31493209690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9833b20-bf48-4b50-8bb6-ca2536d27eba/how_much_oil_does_my_predator_6500_generator_take.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/you_can_heal_your_life_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/fifokosesanafuruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a3e977-3469-461b-ad4b-3922c990705b/is_the_river_styx_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/kegamunijotukijep.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/nonorex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b7fca5-0dc5-41cc-b3e9-94ff31d3f558/how_to_program_rca_remote_to_magnavox_tv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 5164 bytes
SHA-256: 715b14437075d4b44d312cb51f9b8aaa5d01358dcfaa917421b40723411c60fc
font_01_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 12600 bytes
SHA-256: 50bd767d28aaee8fadb8246106c74af89a3088b528c3c7b014ee9e017bce6581
font_02_sfnt_off00013b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B41 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501