Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cae48d87a77ebca…

MALICIOUS

PDF

82.8 KB Created: 2021-03-28 10:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ea1be624e888560b2b6293f20d8067f SHA-1: 8ef748974d82434736fb8f751420047e04e5b731 SHA-256: 9cae48d87a77ebca0b738614c742c8ee65a7f162d192e94769045ed9618ece3b
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 0.9990

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://mezovuduw.ru/123?utm_term=physical+geography+of+europe+worksheet+answers PDF link annotation
    • http://pelubexeto.getenjoyment.net/tower_of_babylon_ted_chiang_ending.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_602085c8018d9.pdfIn PDF document text
    • http://teagreen.space/pipefitters_union_wages_mn13lek.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/evermotion_archinteriors_vol_49.pdfIn PDF document text
    • http://paselon.getenjoyment.net/the_beekeeper_s_handbook_fourth_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fe856fe08679.pdfIn PDF document text
    • http://7evenrp.ru/cooking_fever_restaurant_unlock_ordero2otz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5febaddfbd339.pdfIn PDF document text
    • http://goldalbum.ru/36_questions_to_fall_in_love_arthur_aronlcvbh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vosimalume/dividend_stocks_for_dummies_download.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/3ds_emulator_free_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecd69ea-b758-417e-8cdd-ca5b64fcfc0b/how_to_master_jeet_kune_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c661ad5-fc7e-4464-94da-0b751670ea15/xikuzezumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb37405b-699b-4bdd-999f-611709c926a6/18283755687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f3dfa1-938b-4fd0-8ab8-33ec58c9dd0a/rijalubesedojuxabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780829b6-f305-4e92-bde5-e215482b97e2/nortel_phone_system_not_ringing.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/no_fear_shakespeare_othello_act_3_sc3.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/rixidazumukinoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f9b312-7097-4a48-96a1-ca537e9ac155/how_to_play_2_players_on_mario_bros_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b892e374-fced-48a0-a1e9-1afc211320b8/que_es_la_enfermedad_tdah_en_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a04c8d2-aea8-4933-9234-206a2073eda3/16207742220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698093d4-1400-4a48-abad-c4b722f9bf80/how_to_make_an_android_app_without_coding.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/piecewise_functions_worksheet_with_answers_algebra_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d0fc09-1565-4919-8408-8cf940528e43/22309405033.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_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 5536 bytes
SHA-256: 349aa298b9b758ab026a8eb0133741b918efef0c70bb00884ae146b9f35b10ac
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 10876 bytes
SHA-256: 2fcd5c899fa5b0a220842205c6db483045597449ac2990c0e78556851138fb50
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67