Malicious PDF — malware analysis report

Static analysis result for SHA-256 577e8903a78e7532…

MALICIOUS

PDF

79.3 KB Created: 2021-06-01 03:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96b7b3df6e3f92ad6e2fc101a0ac1866 SHA-1: 23d58b800b65c655738f5e068a129d08a215dea5 SHA-256: 577e8903a78e75327eeb7159f93d6822a577fa8e293de5f50fdabada8943f4cc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/pbw?utm_term=how+to+clean+yellow+dyson+ball+vacuum PDF link annotation
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/8064057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5ff5a954e4a9e.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/juzikake_virodunilor.pdfIn PDF document text
    • https://jetireduru.weebly.com/uploads/1/3/1/4/131453335/posemaguwufijipeva.pdfIn PDF document text
    • https://vujexuxifu.weebly.com/uploads/1/3/0/7/130739824/foluvinadav_tevekenotom_mituxisukola_pimefejabole.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485443/normal_60b34e78d5354.pdfIn PDF document text
    • https://ruzesemuzonasow.weebly.com/uploads/1/3/4/0/134017575/galedofa-veguwosa-suwijibu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384820/normal_60aff28a42b51.pdfIn PDF document text
    • https://tatojevukud.weebly.com/uploads/1/3/7/5/137508330/9961160.pdfIn PDF document text
    • https://wofogubegir.weebly.com/uploads/1/3/4/7/134728038/sofaxawevoboxi-lapuzu-lumukinafapem.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/4029437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazumadu.pbworks.com/f/kovebetanafu.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/tales_of_the_yawning_portal_maps.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/vutuxosusepamaponemise.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/download_film_teman_tapi_menikah_2_layarkaca21.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144433878/povekekugori.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/how_to_get_mods_on_minecraft_education_edition_windows_10.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/78383415293.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/46405299344.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144438564/luzutesudedun.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144439029/98396126472.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/how_to_descale_ambiano_coffee_pod_machine.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/bypass_frp_samsung_s6_edge_plus_android_7.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 5344 bytes
SHA-256: eb2d3ac57f0a7c60be14caa966232c121a9a3c358799c28fa3de308560eebf99
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 10536 bytes
SHA-256: ec1a4961de2ac2afbe84a341e76b7e7f0274e930989ca9d511af5f1916ec8f75