Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f683e8a4520b73f…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 11:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e41320f971d871a6339e38baab193827 SHA-1: 7fd8f1541f15e0c8b8c912bafe2f3ca99df1be40 SHA-256: 1f683e8a4520b73fe62e60602c2fcfcda7a95c6d43c0cec933fe42f5a8d48973
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/strik?utm_term=master+forge+smoker+cooking+times PDF link annotation
    • http://ripelavezomosiv.iblogger.org/accuracy_and_precision_worksheet_answers.pdfIn PDF document text
    • http://roxopazin.iblogger.org/bubamofavavepuk.pdfIn PDF document text
    • http://tesilav.sportsontheweb.net/22597011597.pdfIn PDF document text
    • http://afracheat7.xyz/the_creature_from_jekyll_island_filmrf3zu.pdfIn PDF document text
    • http://keysecret.ru/club_car_precedent_for_sale_in_michiganr3b1d.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/checkers_board.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/tokuvekoxasibokidanora.pdfIn PDF document text
    • http://wodaretibinusad.22web.org/cancer_diet_book.pdfIn PDF document text
    • http://weareanonymous.org/896518824775vi9w.pdfIn PDF document text
    • http://lujadexezusunam.22web.org/weather_report_booragul_nsw.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/16434731436.pdfIn PDF document text
    • http://zurabutodiriwa.22web.org/33151431278.pdfIn PDF document text
    • http://dorutote.scienceontheweb.net/free_bookshelf_plans.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/85873337637.pdfIn PDF document text
    • http://freefire-gifts.com/61739604897l5dld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_f14071cbd9e647c793da7759fcc73dd9.pdf?index=trueIn PDF document text
    • http://wokonudiru.epizy.com/73562466279.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_e72e9864a83c44bb9a673242e7e8cc86.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_29e09dd6f9a4467eb1c740f9120ae260.pdf?index=trueIn PDF document text
    • http://soranodabiwegi.myartsonline.com/alternity_gamemaster_guide.pdfIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_0281f8c87656482e9b6b8ac053c4e900.pdf?index=trueIn PDF document text
    • http://jusopuzirefil.rf.gd/sagogumuzuxipazu.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/9896401920.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/tipos_de_informe_de_auditoria_financiera.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 5028 bytes
SHA-256: 4811566c86da28a0fd6620c725586a2287f138e7434c7972027c9a67098289b2
font_01_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 11544 bytes
SHA-256: ec271b7de7299339c91fe81c3dc139b06b742d8693b0ace59ee31fe5f2b77645
font_02_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361