Malicious PDF — malware analysis report

Static analysis result for SHA-256 d755cb7f6f54ac08…

MALICIOUS

PDF

77.0 KB Created: 2021-03-21 03:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a167d2c046389ac73ff34bdcb8202750 SHA-1: 7143066db2444b1bb12d94f6161a030249e7b8a7 SHA-256: d755cb7f6f54ac0803c94b4634ba1788a2781449cfb0a4d8a647b537233ee7a7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9992

Heuristics 5

  • 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://baarspo.ru/wix?keyword=rate+my+professors+byu PDF link annotation
    • https://cdn.sqhk.co/luwukamuku/5emiijc/forgotten_weapons_ian_mccollum_bio.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/DhbHK0a/color_fill_3d_program.pdfIn PDF document text
    • https://cdn.sqhk.co/motixekotet/hfgewia/allegiant_flights_to_florida_keys.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/ifjhiY1/battle_simulator_total_apocalypse.pdfIn PDF document text
    • http://harkateine.fun/minecraft_pe_ultima_versionfxgpw.pdfIn PDF document text
    • http://izzzaaa.space/retikadetebotli7i.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/ez3Yij1/defy_gravity_trampoline_park_coupon_code.pdfIn PDF document text
    • http://douchehq.xyz/duxugokupivukotepeka452pz.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/37a7bec6-29c9-4a52-8e5c-03da33de5641/25025748301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2078b897-594c-4e80-90e7-c9f4fa6170bd/40653218517.pdfIn PDF document text
    • http://titaleze.rf.gd/xanudasajutefewuvepigate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8182963-914b-44aa-804b-0637ecd7f722/maytag_neptune_washer_spin_bearing_replacement.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_a53e4cbba10840b995c4d9cca3001869.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7472785c-5daa-406f-ada6-95edf21192eb/goat_simulator_ritual_sacrifice_for_a_greater_purpose.pdfIn PDF document text
    • http://vufigoreg.epizy.com/9839559984.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_f1d6552f1eeb4d70a3da2af2288384bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b785cab-acfb-4645-83cf-e1b2cc8311f0/do_you_need_training_to_be_a_vet_tech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a359d3-45c1-403b-ae43-99ac9be43742/new_york_map_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ad3b56-a776-441b-950e-7ab732e6c287/resumen_del_libro_etica_para_amador_completo.pdfIn PDF document text
    • http://rawuzogese.rf.gd/skialper_buyer_s_guide_2018.pdfIn PDF document text
    • http://duvufewitopemaw.rf.gd/bedelesididiboda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e594b308-954b-4e9c-8f85-b3777a158b61/how_do_you_program_a_honeywell_thermostat_rth2300.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_30b56f3820bf45b8a7ac9f49d7bb3aeb.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5264 bytes
SHA-256: a2c8db64bfeb3fe7b6168baca843d8aa3801d107782a45f17f62d4daeedce085
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 11144 bytes
SHA-256: dbf2a7ef2a6b8136946d3782c4900ad8326094d81e50d1cd147dd56036d52dec