Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d56a727f19a86de…

MALICIOUS

PDF

88.2 KB Created: 2021-05-06 22:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b664fc8d2cd6cc652d71fef97cba97da SHA-1: 768e938a71e9cecacd925805c14ee1a3e0a77ab4 SHA-256: 9d56a727f19a86de42936706469c0a2a7b2abebe4d8c240a8875fc0ec1b2ac6d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://resalured.ru/strik?utm_term=how+do+you+influence+your+friends
    • http://talemine.getenjoyment.net/partnership_tax_return_2020.pdf
    • https://cdn.sqhk.co/zezinojox/akjjFQb/49429458027.pdf
    • https://cdn.sqhk.co/gotirawuz/fGhbghZ/starfish_story.pdf
    • https://rasaputale.weebly.com/uploads/1/3/5/3/135323831/xenopupixane_pofelofut_kivon_fijupi.pdf
    • https://cdn.sqhk.co/tesolivu/pZojb1c/7259545889.pdf
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/be8a4.pdf
    • https://cdn.sqhk.co/suxupijisajo/jehe85d/mimosu.pdf
    • http://zitosuganenat.medianewsonline.com/awaken_the_giant_within_tony_robbins.pdf
    • https://cdn.sqhk.co/fenazijeguk/YDfhdjg/temple_run_oz_game_download_play_store.pdf
    • http://zesepajokab.22web.org/94212513607.pdf
    • https://cdn.sqhk.co/potasuregoz/YQaWieI/modern_home_arcade_cabinet.pdf
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/ccd65f01bcb4.pdf
    • https://cdn.sqhk.co/baxorurifina/gcicjix/zikibenupimedoga.pdf
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/4c004aca3.pdf
    • https://difegalit.weebly.com/uploads/1/3/2/6/132681294/5164559.pdf
    • https://cdn.sqhk.co/biwizalibe/ihZE1aC/kingdom_pixel_art_game.pdf
    • https://cdn.sqhk.co/raguwubives/zniGhaY/ice_cream_in_a_bag_with_milk_science.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://magajavopisili.epizy.com/wesuxumap.pdf
    • http://kewetanetoza.atwebpages.com/geotechnical_engineering_principles_and_practices_2nd_edition_free_download.pdf
    • http://romufadi.epizy.com/xukaroturavinedidi.pdf
    • http://gedorigakijalag.epizy.com/bula_alginac_1000.pdf
    • http://lavovexerok.epizy.com/32210778508.pdf
    • http://viputuv.rf.gd/haploid_gametes_form_a_diploid_zygote.pdf
    • http://xamopalamusep.rf.gd/tedazufixidotusudub.pdf
    • http://jepitatumezelo.epizy.com/jenojavuxutarif.pdf
    • http://nowageg.onlinewebshop.net/nivamevubakupudofuxeli.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_off000119c7.bin
11e0b04a0b6f1de761494d4ab1f46834e89d7e43bd215059afe1e709d2d882a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 4960 bytes
font_01_sfnt_off00012ad3.bin
cfcba879d3c64c0226287aa530dc8df70a96a398c3129c176568502ef3392b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 11588 bytes

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