Malicious PDF — malware analysis report

Static analysis result for SHA-256 643b123a891ef3c6…

MALICIOUS

PDF

84.5 KB Created: 2021-04-02 10:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c84b5d25edf7aa32202698d31af9f9 SHA-1: 6e8ac47d3286656c306b973e67c9b2c39bf550c8 SHA-256: 643b123a891ef3c6958c5ddabdabe64c8b4b3ae7e01de541d911a80f214a603a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF SEO Link Farm', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jacksth.ru/strik?utm_term=why+is+my+sun+sign+different+in+vedic+astrology
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/rufizosa.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_60166a5145ff6.pdf
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/gusoxiwuwozolewifir.pdf
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5fe4f7c0a9d25.pdf
    • https://cdn-cms.f-static.net/uploads/4379618/normal_6044ae469e4e7.pdf
    • http://janipuwibir.mywebcommunity.org/active_transport_of_glucose.pdf
    • http://jiteruruw.sportsontheweb.net/programa_de_estudios_2011_secundaria_matematicas_primer_grado.pdf
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/dimumigasezop-tixawe-mawofum-jozesojile.pdf
    • https://cdn-cms.f-static.net/uploads/4495988/normal_60486e610597f.pdf
    • http://mujododaziwato.scienceontheweb.net/juruwulopuzeminegepezosu.pdf
    • https://cdn-cms.f-static.net/uploads/4401723/normal_605d8b40d63dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_cc39c8538eea4b97a591582b457c7fe7.pdf?index=true
    • https://s3.amazonaws.com/sazixipame/application_form_for_us_passport_card.pdf
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_dbfc07f77f9d49b9a0569d9f30e72192.pdf?index=true
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_b07f846b8f434a08bdb84ddd42e6b9c5.pdf?index=true
    • https://s3.amazonaws.com/tapelu/taxorif.pdf
    • https://uploads.strikinglycdn.com/files/19eb5ff2-f09c-4367-9f1d-c401bbd196d4/what_does_marshall_mcluhan_mean_when_he_says_the_medium_is_the_message.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_42ef199ccf55453382086a71ed32ce1a.pdf?index=true
    • https://s3.amazonaws.com/xamibudasagas/arabic_keyboard_layout.pdf
    • https://uploads.strikinglycdn.com/files/47943fb3-839c-4a66-87f5-1c105fa21dfe/21192371898.pdf
    • https://uploads.strikinglycdn.com/files/b26feb87-1a0e-4331-8687-a653621e6641/fijakolatomododupugeretev.pdf
    • http://lumosaneja.onlinewebshop.net/land_survey_equipment.pdf
    • http://binuwuzipu.myartsonline.com/tuwefeteluf.pdf
    • https://s3.amazonaws.com/xalexojaxipud/learn_chinese_characters_traditional.pdf
    • https://uploads.strikinglycdn.com/files/b34be050-5a7e-413a-ab51-e904c2f4ff5b/retomiziluguzotowoserid.pdf
    • https://s3.amazonaws.com/tetenifeme/toque_de_bandera_letra_para_imprimir.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_off0001020d.bin
56994d6fcadaf07fface6678694f25532ee2ad04500f45bef4e8d7979b8c8ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 5612 bytes
font_01_sfnt_off00011507.bin
73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 1936 bytes
font_02_sfnt_off00011e4a.bin
36fa4cb0fcae3f7678b3b1d37f7a863d059537e6ff081b68c6dfbc49bc90250d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 10860 bytes

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