Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3164a0c1bad6f3…

MALICIOUS

PDF

81.2 KB Created: 2021-03-24 02:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8fc3fddce6f4e2ea6d79c65f7e6d721 SHA-1: 2c7c4ab5d5b7280e08f5b64e90c6dd28219e5995 SHA-256: 3d3164a0c1bad6f30f1d0d6a28e0ca2fa6efdfc7e4fb75ee892d818f2a8cb125
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL pointing to 'botokaw.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a search query, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://botokaw.ru/strik?utm_term=where+is+the+reset+button+on+a+ruud+furnace
    • https://static.s123-cdn-static.com/uploads/4415077/normal_5fe02b9766113.pdf
    • https://cdn-cms.f-static.net/uploads/4386849/normal_603c52e15fbcf.pdf
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5fe1bf7ec129f.pdf
    • https://static.s123-cdn-static.com/uploads/4495858/normal_5ff60472f36d0.pdf
    • https://cdn-cms.f-static.net/uploads/4419826/normal_6015a0c034a32.pdf
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5ff4c0d168eef.pdf
    • http://rewuvov.iblogger.org/how_to_make_fairy_bread_procedure_worksheet.pdf
    • https://cdn-cms.f-static.net/uploads/4459621/normal_6050e7dc15cef.pdf
    • http://kipokefurur.mygamesonline.org/dan_carlin_the_end_is_always_near.pdf
    • https://cdn-cms.f-static.net/uploads/4450424/normal_600a4e0991716.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_6052cbf08c3b7.pdf
    • http://muzojumovove.iblogger.org/abecedario_hebreo_traducido_al_espaol.pdf
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fd677667a8b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8380b903-9aa3-432a-b7cc-fcc275ef3f54/starting_point_andy_stanley_season_24.pdf
    • https://uploads.strikinglycdn.com/files/2447e0f8-7314-452c-b128-46fa70c0aa55/26599549665.pdf
    • http://pexoroxijaseduj.rf.gd/what_is_the_main_difference_between_the_julian_and_gregorian_calendars.pdf
    • https://s3.amazonaws.com/pewebopufupe/free_printable_kindergarten_worksheets_letter_u.pdf
    • http://tiredosutozol.atwebpages.com/fomijuwonawe.pdf
    • http://sirowozikuko.epizy.com/pronunciacion_de_verbos_regulares_en_ingles_d_t_id.pdf
    • https://s3.amazonaws.com/bomupi/28006813993.pdf
    • https://s3.amazonaws.com/senodiw/arteriovenous_malformation_eye.pdf
    • http://vonimamodiji.rf.gd/wantagh_ny_driving_test_location.pdf
    • https://s3.amazonaws.com/kosipefojaw/simple_sentences_for_kindergarten_worksheet.pdf
    • https://s3.amazonaws.com/kitakilesa/dell_precision_t7500_bios_settings.pdf
    • https://uploads.strikinglycdn.com/files/0195c94c-083e-48b6-9e1b-3365439de370/economic_development_definition_ib.pdf
    • http://ximuxulizi.myartsonline.com/beowulf_old_english_download.pdf
    • https://uploads.strikinglycdn.com/files/9ccb8351-f0df-4d66-a9ac-a1ead65af248/american_buffalo_2019_one_ounce_gold_proof_coin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014c.bin
738a792564bb48a955faa434215b018f48980c1e1b0d0b23ae748056f2833ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 5232 bytes
font_01_sfnt_off0001131d.bin
8e9088f21944ffde41cd4f42066f5b01b9d35c6490e0c128fa65ea5e77b0a1f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 10496 bytes

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