Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50fe9c79f04c9b4…

MALICIOUS

PDF

75.0 KB Created: 2021-03-23 01:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ab05d24dcd8d59a439809a18e900154e SHA-1: 4fe5d5dc87a77065fe4448af0b5e14dfe5f42395 SHA-256: a50fe9c79f04c9b429b58c8898cb230dc95bb7778937539f071aa53c8e84f5ec
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, indicative of a link farm used to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=jnv+class+ix+admission+form+pdf PDF link annotation
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/ac3fec24.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/how_the_grinch_stole_christmas_2018_on_netflix.pdfIn PDF document text
    • http://lishop.site/battle_angel_alita_last_order_omnibus_download6lv6n.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/2363367.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/jenobovijudide_jofidalalinos_tulukul.pdfIn PDF document text
    • https://zefimaral.weebly.com/uploads/1/3/0/7/130776827/2728427.pdfIn PDF document text
    • https://jepexilopenokaf.weebly.com/uploads/1/3/2/6/132680937/tevapuluxe-gijowemopusoz-doxaladilere.pdfIn PDF document text
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/tiziteno.pdfIn PDF document text
    • http://ctuxuu.com/mudagatubezoyu2bg.pdfIn PDF document text
    • https://javisifuwo.weebly.com/uploads/1/3/5/3/135304639/gikamirovad.pdfIn PDF document text
    • https://wejerimaz.weebly.com/uploads/1/3/4/6/134648800/8127753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/38621590986.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/cardboard_sheets_24_x_36.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/maserofimiso.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/whatsapp_status_video_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/battleships_grid.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/brilliant_life_publishing_a-_z_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/canada_visa_family_information_form_signature.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/stellar_competent_cells_transformation_protocol.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/elements_of_poetry_ppt_slideshare.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_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 5416 bytes
SHA-256: 4f2798d7ea9642561e31906c6b5e1269276b764be82d1b35bfa9de9a147859f4
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 10604 bytes
SHA-256: f353a8804f93d8069a424afd946394ed5eaf017a89da31c612b341725f6b264b

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