Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25ecd8f527f90f2…

MALICIOUS

PDF

78.7 KB Created: 2021-04-09 14:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: abe011cc6e8c50801cf7832930745fe5 SHA-1: 1e9656899b279142866c05920dfe0dc7fe4ccf42 SHA-256: c25ecd8f527f90f251e038ced250b6a51cfbe2dcc73b73adcc166c697628d797
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to boost SEO, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains text related to a 'Vizio sound bar manual', suggesting a lure to a phishing or malicious website. The presence of external URIs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=vizio+sound+bar+5.1.2+manual PDF link annotation
    • http://xitabijasava.getenjoyment.net/65196292129.pdfIn PDF document text
    • https://gadefume.weebly.com/uploads/1/3/4/3/134337819/2574702.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/Tfhhkhf/xolokedoduzoguratusuvov.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/janatha_garage_movie_video_scenes.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/r2Ajdig/36059803420.pdfIn PDF document text
    • http://funafiwutera.iblogger.org/mtabolisme_des_composs_azots.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/tajawelegivujipup.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/hhdhiRP/vudezepegusonuv.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/ia0jdEz/las_vegas_tournament_of_kings.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/tariwa.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/jezojanofeloxumimomi.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/be5c99535cfcf.pdfIn PDF document text
    • http://wedamevurebu.22web.org/wewafevoputogizekugena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxuveboxazaw.epizy.com/algorithm_book_by_sartaj_sahni.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/67890235440.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/how_to_calculate_motor_nerve_conduction_velocity.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/nevififufejebarika.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/jurassic_world_mod_apk_2018.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/cell_structure_and_function_class_8_download.pdfIn PDF document text
    • http://zerimokima.rf.gd/forever_aloe_gelly.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/battle_angel_alita_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/bekezatuk.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/gokonujejo.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_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 5468 bytes
SHA-256: 601655b73ddd2bdfc5a4db9c38e0b0fb2a5a90d86e8e9f411441c7191c211a31
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10636 bytes
SHA-256: e5bb2c8d52937ae107729691ffff5cb4543189a13a62a7cfcaf18cc8ddb382de

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