Malicious PDF — malware analysis report

Static analysis result for SHA-256 6424dc692f4b7c77…

MALICIOUS

PDF

80.8 KB Created: 2021-04-06 15:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d1ee47fc119d14b8b069d17c7c5177 SHA-1: 7f7df9685b1891b1cf3d411a01f4ccf358412a4c SHA-256: 6424dc692f4b7c77e1fa87f3f8776b289d12c26c18e3a358fe361786f5829287
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and other free hosting services, which is characteristic of a link farm designed to obscure malicious content. The primary URL suggests a lure related to sheet music, but the heuristic 'PDF_SEO_LINK_FARM' indicates a mass of links, likely leading to further malicious PDFs. No scripts were extracted, but the presence of numerous external links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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.
  • 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://nipisod.ru/123?utm_term=hotel+california+classical+guitar+sheet+music+pdf
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/nujewodedipiwowunapa.pdf
    • https://marabobufazezi.weebly.com/uploads/1/3/5/9/135992859/jatixofera.pdf
    • http://takaweri.mywebcommunity.org/past_simple_exercises_with_answers.pdf
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/d62a0a41b9b5.pdf
    • https://vevabute.weebly.com/uploads/1/3/4/2/134265428/dojarij-pelofewidaje.pdf
    • http://joxitikoki.getenjoyment.net/wesozagomixorifofat.pdf
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/6478020.pdf
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/9762727f0177972.pdf
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/c693b395.pdf
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/9906792.pdf
    • https://gugebizibepowe.weebly.com/uploads/1/3/4/3/134364706/pojaxominub-wixatugu-timafabiram-xebagexexuvin.pdf
    • http://xuxodowenam.getenjoyment.net/algebraic_expression_worksheet_for_grade_6.pdf
    • http://xutefizil.getenjoyment.net/bixolon_srp_350_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zagofij.onlinewebshop.net/bhagavata_purana_sanskrit.pdf
    • http://girifatu.rf.gd/what_is_the_best_keurig_coffee_maker_for_a_single_person.pdf
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_529af6b7878e4f20968984acce87d2d4.pdf?index=true
    • http://watokugen.epizy.com/96666259583.pdf
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_e7f5702dcd3e4e2d895be198c78e4dee.pdf?index=true
    • http://ketabigumowun.atwebpages.com/borges_labyrinths_contents.pdf
    • http://xizemem.rf.gd/buninomenajuju.pdf
    • http://kubomefewofumim.atwebpages.com/toyota_camry_seat_covers_2007.pdf
    • http://levuvuz.rf.gd/to_day_eenadu_news_paper_download.pdf
    • http://zogosugo.onlinewebshop.net/4_pronged_approach_in_reading.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_off0000fd00.bin
1b2db545b55b391980cfb830ec62f948faf4db13e504eca0092ba1e0a2ca5cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 5528 bytes
font_01_sfnt_off00010f9f.bin
bfb299aa9a0aaaf1e3ea95301d5d71fdf4c83e940f0c864d883a5086f3294305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 11072 bytes

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