Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc275877f9ff926…

MALICIOUS

PDF

78.7 KB Created: 2021-03-16 09:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca2cf69e0893daa13b2939e61cbe242 SHA-1: efdd9a40dbef9cc60891d5f94eefb2f6563dfc2a SHA-256: dcc275877f9ff92641e5271e34b450f8e9862d14225106fa0d29b26199171f0b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one being https://dafemum.ru/award?keyword=causes+of+teacher+absenteeism+pdf, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=causes+of+teacher+absenteeism+pdf
    • http://jisutuxoxaza.medianewsonline.com/what_is_dna_molecular_biology.pdf
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/9c4c84bd.pdf
    • http://nitanupemil.mygamesonline.org/what_kind_of_pipe_is_used_for_exhaust.pdf
    • https://vakevugulipew.weebly.com/uploads/1/3/4/5/134507067/1806269.pdf
    • https://cdn.sqhk.co/nakijalufiw/WUzKghM/avion_dispo_flight_simulator_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5ff633a0d00f4.pdf
    • https://cdn.sqhk.co/ralapogifur/jakJRid/vr_pinball_ps4.pdf
    • https://static.s123-cdn-static.com/uploads/4421471/normal_5ff624e6d341a.pdf
    • http://tuwimig.scienceontheweb.net/the_modern_breakup_book_download.pdf
    • https://cdn-cms.f-static.net/uploads/4451756/normal_6041d80fd7bb5.pdf
    • https://cdn.sqhk.co/pefemezized/bKfrvih/54508364042.pdf
    • http://zumepaposakuf.scienceontheweb.net/staff_accountant_interview_questions_and_answers.pdf
    • https://cdn.sqhk.co/zenekukera/ehejjaW/27880178160.pdf
    • http://janorewaxeno.mygamesonline.org/89946244848.pdf
    • http://dunodipike.sportsontheweb.net/44402224790.pdf
    • https://cdn-cms.f-static.net/uploads/4485301/normal_604eccbb1202c.pdf
    • https://cdn-cms.f-static.net/uploads/4475716/normal_6049b7a863a5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://koradanizepagow.myartsonline.com/adobe_reader_merge_documents.pdf
    • http://kewetanetoza.atwebpages.com/nusanotatijetojasubovi.pdf
    • http://fadirejanebebi.epizy.com/jurnal_tumbuhan_gymnospermae.pdf
    • http://jamanofubuvi.rf.gd/56603084489.pdf
    • http://zogivumomu.epizy.com/avicenne_energy.pdf
    • http://sazojojuw.rf.gd/darkness_rises_classes_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f724.bin
39c20a4a64e5589e4a43ea1d8fb213ee8b92bc89a4fef6e9a71e99103ad6000b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 5408 bytes
font_01_sfnt_off00010954.bin
62cdaea576e3ce16f07f32b0b6b72e2d10162d30f08a9aa933742201b054d7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10620 bytes

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