Malicious PDF — malware analysis report

Static analysis result for SHA-256 111cd8ae7e153233…

MALICIOUS

PDF

87.0 KB Created: 2021-06-12 14:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cb26927fd4513bdd9ca9ecae4e583a71 SHA-1: 5539ade7e6a72468d7f3172d17afadcba2aefd04 SHA-256: 111cd8ae7e153233467184b34bf971b107ac598cc8ba408cd2d328c1accdac4c
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/123?utm_term=login+form+template+w3schools PDF link annotation
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/jokasobumetaxodomi.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/f636fe.pdfIn PDF document text
    • https://vififeroxesazu.weebly.com/uploads/1/3/4/7/134737415/dutepuroba_nowixelewala_jizurav_wivilat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_603197f0cfc4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_60baf86920573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5ff1149f952fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxakuruvi.pbworks.com/f/stephen_king_rita_hayworth_and_shawshank_redemption.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778ba781-e607-4033-a8f8-3ff4cdc00c31/pokemon_all_tv_series_list.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/f/luka_chuppi_movie_songs_download_webmusic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8032f9-f55b-4591-8efd-e756e7dcd1b7/motoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d089ab75-f2a3-42a1-ae08-eeae79ccbc34/when_can_baby_front_face_in_baby_bjorn.pdfIn PDF document text
    • http://lururefisu.pbworks.com/f/bikupebivodu.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/blackweb_wireless_bluetrace_mouse_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53568f9-5211-4d96-8f2d-d5090cc4ff44/kirojugolamamazaroje.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/freeletics_bodyweight_pro_apk_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17584ec7-6964-45b4-b945-d9ab00b2a872/xabiwoximozatun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a5346d-9bb6-4da5-b1a4-e1a97ce3aa19/resmed_airmini_change_filter.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/w/file/fetch/144942039/72949078526.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/cheat_codes_for_marvel_contest_of_champions_iphone.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/37495974845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3088bcd9-b10a-4942-9333-9f7550450bc9/maintenance_and_troubleshooting_of_marine_electrical_systems.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144547932/33912523697.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_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 5628 bytes
SHA-256: 97682043d10c8a639bbe1488e26d167ac759554ddd998ea03d5166044d561fdf
font_01_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 12048 bytes
SHA-256: 00fb2b472ad2cdf93b48b605a875fd91a3e9f4a7901a299fd4ff3ba9df5c209e