Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cd41513865c9bc…

MALICIOUS

PDF

153.6 KB Created: 2021-03-01 14:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 801fab843fd661cc91fbb858c684b83c SHA-1: 4dd9856aa0e19a94a88d1b1528c57d8b3eb362a5 SHA-256: e8cd41513865c9bc599af43cdd9fda7cb4e0b56da8101bf9e16725c41e134317
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier output confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://resalured.ru/wix?keyword=comsol+multiphysics+reference+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449615/normal_600e081bd487d.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/muvalokiw.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/29e93458643f62.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/SeWVghZ/48134642093.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/64084892314.pdfIn PDF document text
    • http://trychambre.xyz/autocad_certification_salary64uou.pdfIn PDF document text
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/e49c72257ad2d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_602be68e2151e.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/95410043560.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/a61bbbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fe41bb35a808.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/cifhegc/the_rock_soundboard_app.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/fcGief7/fipilokigiwokuguworulap.pdfIn PDF document text
    • http://goodnaturak.space/how_to_use_slow_cooker_feature_on_instant_potqq74z.pdfIn PDF document text
    • http://pressit.fun/29580062524qu3jl.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/louise_hay_meditations_to_heal_your_life.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/what_is_meant_by_the_origin_of_species.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499622/normal_5fcd351f2d070.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/hjcThaI/billboard_photo_frames.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/sebunuzu/uscf_chess_rating_lookup_old_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/foundations_in_personal_finance_answers_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/where_to_go_after_lilycove_city.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/goldsheet_nfl_live_odds.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA4A 5368 bytes
SHA-256: 082319bd6b9529d5ddffef7080858a819b0a7a560c46112475c2cafdcded6899
font_01_sfnt_off0001ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC2B 6460 bytes
SHA-256: f8984e9593ee9d461129857dbabf8292e4beb15fcc2cb9ac194b5b91453b4d6d
font_02_sfnt_off0001fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBF7 19952 bytes
SHA-256: b6abe6ae11b78ceae06d3ff3790dc7788ee50a60aa8122482ce53866296ce601
font_03_sfnt_off00023b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B10 17312 bytes
SHA-256: c27abe9a5a0806539b3d69d69a8e797acd4834621d6ca6563d24d098bbab3d1d