Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d9deb9fce26470…

MALICIOUS

PDF

82.8 KB Created: 2021-03-25 11:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c1d6106c8014d0b49d9cf745d4a7437 SHA-1: 175541da96cdbeba2106951dd5112c434c38f876 SHA-256: e7d9deb9fce264702510d4edacc847fda8ae248893ca1beb93d85364e53eca53
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate content, but ultimately lead to potentially malicious PDF files. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further payloads. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=gb+whatsapp+apk+download+apkpure
    • http://azorocheat6.xyz/tujazadojogizujodufb6a1.pdf
    • http://duxinivodozular.mywebcommunity.org/bosesomupowufalimu.pdf
    • http://wibusutozojoz.iblogger.org/what_are_the_types_of_construction_projects.pdf
    • http://wegoluxetas.scienceontheweb.net/webozafewuxifopowuzemitib.pdf
    • https://cdn.sqhk.co/biwopeka/ijjjZRJ/joker_english_song_download_pagalworld.pdf
    • https://cdn.sqhk.co/zofizitene/OjiYjji/pupifukosafufisuw.pdf
    • http://springtea.space/jafomegureroly3fni.pdf
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/vomuful.pdf
    • http://naturmilans.fun/harry_potter_y_la_camara_secreta_audiolibro_carlos_poncecw4l2.pdf
    • http://narovomesizi.medianewsonline.com/feedback_amplifiers.pdf
    • https://wibafodutaselo.weebly.com/uploads/1/3/1/3/131380847/7247538.pdf
    • http://lnstagaram-verifiedbadges-from.com/96239210141xmva9.pdf
    • http://malanefire.sportsontheweb.net/keluwufadifokiniriwirun.pdf
    • https://cdn.sqhk.co/dolavalof/igjiejc/gray_hardened_clay_minecraft_recipe.pdf
    • https://cdn.sqhk.co/kazamepa/l2KjfGx/super_sling_island_2d_adventure_kong_crazy_junglers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6198209e-bbd1-4016-b3f9-03737a5f3961/does_bodyweight_training_burn_fat.pdf
    • http://gitinilu.epizy.com/ielts_speaking_sample_answers_band_9_2020.pdf
    • https://uploads.strikinglycdn.com/files/f11d8506-15c1-4b01-8d08-7271bf7f8d26/como_referenciar_un_libro_con_autor_corporativo.pdf
    • https://uploads.strikinglycdn.com/files/3bdf32aa-c8b4-47d7-af61-778d39ba982e/painting_cabinets_with_chalk_paint_and_wax.pdf
    • http://zakivijojinikij.epizy.com/jazz_arpeggios_piano.pdf
    • https://uploads.strikinglycdn.com/files/162fb97d-185f-4aa2-85e1-65a0baa9b6db/xizewetitopab.pdf
    • https://uploads.strikinglycdn.com/files/14679bbb-97f5-4a0f-a1a6-b5d1db79bf2e/72206126366.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e4.bin
59f9c9f87630af177378105f92029ed7452fbf0b4c5e7a2706d67ccc5f2d5bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 5208 bytes
font_01_sfnt_off00010b9b.bin
0492447ad8bea750f9e119dddcf4e8b62bca6b76b2167158c3c20bf7ac858d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10684 bytes
font_02_sfnt_off00012fee.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 4324 bytes

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