Malicious PDF — malware analysis report

Static analysis result for SHA-256 1703f0eea2db7de0…

MALICIOUS

PDF

75.1 KB Created: 2021-04-23 07:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c284e3c02da2340e874caa4e39a9dcfa SHA-1: 7da3abc8be2729dca43f8a667afc8c7d382f3673 SHA-256: 1703f0eea2db7de0e878eb1d6be2dbc03c1af0d6d9d9b75f4fb2fbeac34c30d6
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which, 'https://resalured.ru/strik?utm_term=what+is+included+in+diagnostic+imaging', is a primary indicator of malicious activity. The PDF's structure and content suggest it's designed to deceive users into visiting this URL, likely to download further malware or harvest credentials. No scripts were extracted, but the PDF's nature as a link farm on disposable hosting points towards a phishing or malware distribution attempt.

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=what+is+included+in+diagnostic+imaging
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ff24071c8003.pdf
    • http://autokenn.com/the_developing_person_through_the_lifespan_audiobooku7wm7.pdf
    • https://cdn-cms.f-static.net/uploads/4408478/normal_602536b615119.pdf
    • https://cdn.sqhk.co/zubejavaxuvu/gig9Tvi/buruk.pdf
    • http://nujagexurej.medianewsonline.com/utero_atonico.pdf
    • http://gagimubu.mywebcommunity.org/75230852309.pdf
    • http://madamzero.com/the_adventures_of_tom_sawyer_quizzes8yso8.pdf
    • http://bimizuzi.sportsontheweb.net/broncos_2020_schedule.pdf
    • http://ferafukapawap.scienceontheweb.net/angle_measures_in_polygons_worksheet_1_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4389084/normal_60657f59bb0bd.pdf
    • https://cdn.sqhk.co/lojibuwe/6Aii2Lq/dosarezirawazuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_8b524f483fb34e6195d95ebb0b4538ea.pdf?index=true
    • https://s3.amazonaws.com/ruzaganog/22799535206.pdf
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_ae4f669457bf47b1934eef1ebf26a077.pdf?index=true
    • https://s3.amazonaws.com/dipafuxe/apeman_trail_camera_user_guide.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_e1bd4216a865412fa653f08944f02363.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ed.bin
3d7f3f09a864a75d8f44896ad2420ec7c69bdb04e8d76683ae092771f0407b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 5272 bytes
font_01_sfnt_off0000fac2.bin
1f09f98d18ee94e06859bfd98e0705751585da68794888eaff9b55f6129fc3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 10808 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.