Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57933de4c992f79…

MALICIOUS

PDF

75.4 KB Created: 2021-05-17 17:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d4affd44ef117037ec7e58e6c86c2c87 SHA-1: d7e5e1a88411f59343eb783c5806526d58288d79 SHA-256: d57933de4c992f799e6301e4c99874d32d094333700728ddf10e36006c057ce0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs like 'https://mezovuduw.ru/strik?utm_term=salt+will+be+dissolved+in+water' are likely used to redirect users to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=salt+will+be+dissolved+in+water PDF link annotation
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ohbAXlH/9903954420.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/71676047285.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/cjCnpYW/the_king_s_chessboard.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/vgejgoi/bomber_adventure_hack_apk.pdfIn PDF document text
    • https://basazujuw.weebly.com/uploads/1/3/5/3/135301233/bebejuxa_xodatotepej_perifema.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/siniwejubizowubituvowobe.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/c3a630b.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/bokuvanetudatisu.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/f1c0f09c-edee-4587-a727-970497dcde07/v_for_vendetta_mask_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/walmart_black_friday_11_14_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/53479605600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c16287b-2218-4f86-8fb2-15e7ccfa1516/the_lightning_thief_musical_cast_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/harley_quinn_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfc73eb-690d-49bf-84eb-1c0f83a23128/mebopakowimumekinabepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710b386d-9dd8-48b3-b7ed-0bd98ac4083c/traductor_de_ingles_espaol_gratis_sin_internet.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/shoot_to_thrill_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16f1117-1bcf-4b8a-8a36-c5bda58cab62/tascam_dr60d_ii.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/totaline_thermostat_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6497f3d5-d879-4f8a-b700-385edb60b88a/nifewedili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc6fd27-383c-4ab5-a4a1-ff6ab3b9c0b1/ejercicios_de_geometria_y_trigonometria_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500d0e9b-c2ef-4814-b778-e151bb207a50/vakebube.pdfIn 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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5216 bytes
SHA-256: f93b680552b069a34016889392281534cf2b044769bd35f0cda99fd6efb016a3
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10988 bytes
SHA-256: 675adde6365bebecac737dc84e7919ed9fafe3a29ee4fd6c61f5b7e69a219877