Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e688fb0ffd59c86…

MALICIOUS

PDF

80.3 KB Created: 2021-06-01 22:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c69e9c96564efd9ec66c0dbbc3fb46c9 SHA-1: 324e7b5dc962e5fa0d90e62e9b3e136573989f17 SHA-256: 4e688fb0ffd59c86ca93ae9b03c73a6f9ec7dcf90823622dec90349ea0cebb25
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with the primary one appearing to be a lure for downloading "Asus ai suite 3". The presence of many links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign. No scripts were extracted from this sample, but the overall structure and URL analysis indicate a malicious intent to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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=asus+ai+suite+3+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495037/normal_5fdc45a1f1144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_605b7362d677d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5ffc6407285a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_600247a5853a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fdb8dff2da92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_606a3656c9092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_60311e8c7307f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144466812/kavepudunuwoxo.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/38431588940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf8179d-835c-47b9-97d5-e5e14e964393/in_broad_daylight_movie_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe49a90-f116-4e69-a7c2-0ae79ee70952/zibatekitezolit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1282d2e6-3cdb-4b3f-b25e-4153d0c9b8e5/what_soccer_drills_do_by_yourself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b840a152-3faa-4816-9a8a-d15035c2837c/matidamexeroj.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144469017/46472644728.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418044/57230635203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11f3cc6-6d99-43d8-b3c4-84dc3201c246/trauma_timeline_therapy_worksheet.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/ruzoluwiwaxotafavuzudu.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144417060/yearly_staff_schedule_template_excel.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/what_does_offer_phase_ext_mean_for_usps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f549458c-f877-414f-ad74-e5f1eae45bbe/60776511766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/270a2ad6-71c7-465b-8d46-da5b5beea58d/is_the_maze_runner_3_on_hulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620c14ad-373c-459b-b987-35242430d3b6/black_boy_names_k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b971089-8238-47fa-94a7-2016102f2d64/vexejizaxasiniv.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144448440/qual__a_raiz_quadrada_de_24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26029508-0750-4bed-90c4-7f4b67bff5fe/nokunuloxixutupegabat.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144443517/67601015156.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144465375/rock_workout_routine.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_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 4968 bytes
SHA-256: 78bbd90c2107a4030db6aec759edb411676ca7ccaed754afe3fb43a892195bbd
font_01_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 11320 bytes
SHA-256: 6be5832efd5b1150aca06bfb6ae2a03e56fb2228370c2c0688c99192076d55e6

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