Malicious PDF — malware analysis report

Static analysis result for SHA-256 6322869553d16625…

MALICIOUS

PDF

71.2 KB Created: 2021-04-15 20:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a66a8414030103bbe4e8c5041eb502f SHA-1: 533a27d20f5945d1acdc19c8cc45eea205ca22d4 SHA-256: 6322869553d16625750362eb696c0a226f314a5e36e64eddba0455881b7e05aa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://xezojetit.ru/strik', which is highly suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=dewalt+dw734+dust+collector
    • http://lg-supportteam.com/toro_leaf_vacuum_mulcher_replacement_baga94oc.pdf
    • http://busforpay.online/subtenant_contract_templatej4edl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/45c0ce38-391d-45a7-a495-8a2f625a4043/computer_hardware_engineer_salary_per_month_in_canada.pdf
    • https://3c31dc6e-14a3-4e60-a373-897e90814001.filesusr.com/ugd/9e17d8_1cc3a989913a4b7ab426f06f591eae34.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9aa711a-6b8f-4363-ad2c-9d47b5ae4fdc/probability_and_random_processes_miller.pdf
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_fb0673fbe2a54c5884ec032d1c72db4f.pdf?index=true
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_b64718fc229044aaa14633bc8aecaf09.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_4d338e0b1aff4d10b1627a5a61404e3e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/61db3b88-a8ba-4470-8cfe-254d22cacc26/how_many_times_per_week_should_i_do_strength_training.pdf
    • https://uploads.strikinglycdn.com/files/e0927f23-e632-4e84-aab1-fc166bbd347f/asmaul_husna_beserta_artinya.pdf
    • https://uploads.strikinglycdn.com/files/48d7b5fc-b38e-4d4b-ad4b-5768e73c28e2/ruger_lcp_drum_mag.pdf
    • https://uploads.strikinglycdn.com/files/edb70b64-c6d5-4497-bcba-43456ac056ac/which_kindles_have_a_built_in_light.pdf
    • https://s3.amazonaws.com/meludav/nufuvajabajibe.pdf
    • https://s3.amazonaws.com/sumesawoxajew/hamilton_beach_12_cup_coffee_maker_not_working.pdf
    • https://uploads.strikinglycdn.com/files/a6973259-2bbd-4a0d-90e8-44c2759a80a0/11116835976.pdf
    • https://uploads.strikinglycdn.com/files/2d6a9c06-7605-4f3e-ad46-0750558fbe5d/28433787466.pdf
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_e84824baa84e434f80d5384c4c737f1c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c6dc3e1-6142-44a3-b3a4-b302623b9816/ejercicios_ecuaciones_de_primer_grado.pdf
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_1ce0543b33d048f9829e2a4ebd101e43.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_960f15b385074b73bc70fc1b427a62ce.pdf?index=true
    • https://s3.amazonaws.com/sazixipame/application_form_for_us_passport_card.pdf
    • https://b7755ffd-cade-4db9-a3a9-94934e762344.filesusr.com/ugd/f84671_b359f0b1ba0a45339da78b254addb44d.pdf?index=true
    • https://s3.amazonaws.com/xeropizuwe/bhai_naa_songs_telugu.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_off0000d7b6.bin
6c6ab9c0b8281e51485681575ca46d8062d40a99106dc418d7bd33e4b94d3b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 5356 bytes
font_01_sfnt_off0000ea20.bin
05ed8822d64c8878490b17bd60fe327e304483e6a528d447cdfb696600d5d400		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 10556 bytes

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