Malicious PDF — malware analysis report

Static analysis result for SHA-256 9272a72bfffd5727…

MALICIOUS

PDF

81.0 KB Created: 2021-04-10 14:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2d56b18a8e5807f374f910c86f27b40 SHA-1: 517f5b8c277717ee65656a4a1d3a4dbc01bb9145 SHA-256: 9272a72bfffd57272086e575093d037e49cd97fcb6be015713d8c437580439e5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to disposable domains, with one prominent URL being `https://resalured.ru/strik?utm_term=how+to+review+a+concrete+mix+design`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a link farm on disposable hosting, suggesting a tactic to obscure the true malicious destination. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a phishing or malware delivery attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+review+a+concrete+mix+design
    • http://gisonanezoboru.iblogger.org/seporol.pdf
    • http://suwedujak.22web.org/neural_network_and_convolutional_neural_network_difference.pdf
    • http://buloshnaya.site/zidaxedivowgec28.pdf
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/wenanape.pdf
    • http://canlisohbetim.net/killing_pablo_audiobook_free_downloadp8qwz.pdf
    • http://jobauthor.online/furipilezetelobewotaxiki6yhzj.pdf
    • http://vienvozvrat.site/imusa_pressure_cooker_instruction_manual2lja8.pdf
    • https://puxasuzad.weebly.com/uploads/1/3/4/3/134352875/xavek.pdf
    • http://kavevisukedawox.22web.org/william_shakespeare_quotes_download.pdf
    • http://romeita.space/carryover_worksheet_line_24_1st_col4nh75.pdf
    • http://xukiwuze.22web.org/princess_bride_free_movie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ef8e2de9-91ca-45b5-8cb5-126879b744d9/factoring_difference_of_two_perfect_squares_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/ddec422e-7d14-4d1a-8f4d-fc3085e98008/35060368745.pdf
    • http://bedekopezedegej.rf.gd/wow_assassination_rogue_guide_8._2.pdf
    • http://merowijesajov.epizy.com/futepodejapigirasajek.pdf
    • http://buvanudune.rf.gd/zokeputaxana.pdf
    • https://uploads.strikinglycdn.com/files/add9280b-6ddc-41df-8556-949586a8e341/47393562729.pdf
    • http://zobovobewuw.epizy.com/showbox_app_free_movies.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27a.bin
f0475ff3d83e3221b5c4c1a934797a8f1b985cd8f571957b046ec183922b669f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 5196 bytes
font_01_sfnt_off0001041f.bin
b01e093eadebf9c788802601fc85cb67928cd17e85855e125eb987fe82a247c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 10836 bytes
font_02_sfnt_off000128ba.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 4324 bytes

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