Malicious PDF — malware analysis report

Static analysis result for SHA-256 95db337c5e4c724b…

MALICIOUS

PDF

103.6 KB Created: 2021-05-16 00:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4e2fc3731d4a6dfee4f754eb942c670a SHA-1: 2f41de0345eb41adfca788c1ec179a0e9287b1ce SHA-256: 95db337c5e4c724b76c996c5b4c5cb5246fcef779fdd73ee4cbaaa53c478c050
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/strik?utm_term=ejercicios+resueltos+de+estadistica+para+secundaria+pdf PDF link annotation
    • http://cadenalia.com/guide_for_ice_scream_horror_scaryrl01t.pdfIn PDF document text
    • http://yachts-4-sale.com/how_to_rehab_ac_joint_separation6tw5j.pdfIn PDF document text
    • http://lusuwivaw.medianewsonline.com/48232688524.pdfIn PDF document text
    • http://mail-autoscout24.net/80479435709ky7z6.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/bushnell_neo_xs_golfuhr_update.pdfIn PDF document text
    • http://confirmationhelpcenter.com/what_is_philosophy_of_realismnqymh.pdfIn PDF document text
    • http://sportplays.ru/siminorogegatupol29mfl.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/347bed3d-9c0e-4c1b-8dc1-fbd1afa39eef/how_many_flat_stanley_chapter_books_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9d8464-757c-45f7-b99c-7cce5b7d7bb2/what_is_the_best_pool_heater_for_inground_pools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc88c320-bb0f-4f16-b164-a8ba5d010781/sony_str-dh750_iphone_app.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_a5c307a49fc7432aa2d705b29ccff4dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c0ae67-bc95-4144-9ecd-16779b55e9b6/where_is_the_garbage_disposal_reset_button_located.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/48428374631.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/nelly_dilemma_audiomack.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/boer_goat_farming_business_plan.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_15619582393c48ea963c0466f0f2890c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e434543-c07f-47ab-8505-c96f356ce925/gekoseti.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/dodazegitavul.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/chainsmokers_songs_free_pagalworld.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_678e994f8fb540cda36acd50ca4081b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/landforms_printable_worksheets_for_kindergarten.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_8c1182e9b4584f4cb71f12755a9d11e5.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 1648 bytes
SHA-256: 5dd67d50d5f82c6a4396cc2c4f535bff9b7bb2931f69234bba48d77275ef921a
font_01_sfnt_off00013ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECC 5180 bytes
SHA-256: 657d13887b6aa7e345999782f96d0771a514cbe19266f8750e7bea73662db63e
font_02_sfnt_off00015080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15080 12276 bytes
SHA-256: f03d43bf25d0b27a1a86dbb47b33032f7349ebd8e397abdd9360f2a74d2aca91
font_03_sfnt_off000178bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BD 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

Open this report in the interactive analyzer, or submit your own file for analysis.