Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4d1c2223151d04…

MALICIOUS

PDF

85.0 KB Created: 2021-04-08 02:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 80eee03bc81484b7eaa26f3db4366051 SHA-1: 7a932b68962fbb15c3550d2ccf2b3a17a5d4cef2 SHA-256: 5b4d1c2223151d04b9ed0754a1503251c49c4a025f0513aba90cd9be4cb68425
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, and includes UTM parameters, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=britax+pavilion+70-g3 PDF link annotation
    • https://cdn.sqhk.co/tifisizeliz/iDZjcN5/bp_ice_cream_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/Lhekiim/barezofizumo.pdfIn PDF document text
    • http://sapiwis.iblogger.org/android_notification_sample_code.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/gg6jehl/byju_s_the_learning_app_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kefivaxepaj/Yiciblq/living_alone_budget_2020.pdfIn 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/b4e5f3d7-edd6-41b4-9d4f-3265bbfd0ea2/35397541651.pdfIn PDF document text
    • http://dizavinizekabos.rf.gd/fuxabunimalaxutawik.pdfIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_85bc029e0fe34c64810fc38af7f380f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0043c845-20d0-497c-90b8-d0216cb92b1c/organic_chemistry_cheat_sheet_reactions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156ca572-d490-4a32-9dab-df8555722409/78123042228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7fcda2c-a388-4983-ab29-b39d81b0d7ed/18154431602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47112b8c-9890-46be-bb19-46465c471539/69441593553.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_6630584b9de949e6a1a425f4f369cbe6.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_5bfc9ebb7e70421a993903033415676f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81cdff8d-a967-4f59-802d-1c5dc61028d9/44381121600.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_c4f2ed113294434a9ee34430fc07da6e.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_d2391950e5fb46baa941034ea20f0f7b.pdf?index=trueIn PDF document text
    • http://newigumumakewi.epizy.com/muruxelilivawokij.pdfIn PDF document text
    • http://jozapatoxijoraw.epizy.com/90894083300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b3168a-1278-4eff-bcf1-97b326816186/xeledemefowefesisunida.pdfIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_887582356e5242e1b7bbb00db7d8a975.pdf?index=trueIn PDF document text
    • http://mutupoda.rf.gd/fomemufizowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9af74b3-27d7-4075-a853-36a6cfd636bc/governor_of_poker_2_apk_full_game.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_c7dfcd5ca2e346a68d9ad142205c77e0.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_e7d1658409f74493b6e8f7fb87700441.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_47ec9eee47bb402cbc1d208cace4417e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 5404 bytes
SHA-256: 44240c48b332ab0b18587b5a5c2742475127c9e2f901cdb5e1507968d5b762c4
font_01_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 12664 bytes
SHA-256: f109f43677a8dca89db5c3d11c821bca012a372deab7100b95903386773344bc

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