Malicious PDF — malware analysis report

Static analysis result for SHA-256 491fda8d1dcaf6f2…

MALICIOUS

PDF

83.9 KB Created: 2021-03-25 08:30:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0371b351193399262737b3bc600c3447 SHA-1: cdcdc55f6e96f6389a7b19c1c79f3d44d9da96c8 SHA-256: 491fda8d1dcaf6f24123c641af2dbc1b0d78f05fd14aace9a61116eda2b9db33
146 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to multiple domains, suggesting a phishing or malware distribution attempt. The heuristic firings indicate a malformed exploit stream and a link farm on disposable hosting, further supporting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing lure for educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jumiwimov.ru/award?keyword=10th+maths+guide+pdf+free+download PDF link annotation
    • http://kefojixesopu.66ghz.com/dipur.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/nuxin.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/aiou_date_sheet_2018_matric_spring.pdfIn PDF document text
    • http://dajexori.mypressonline.com/how_to_use_farberware_single_serve_coffee_maker.pdfIn PDF document text
    • https://rosunitekuw.weebly.com/uploads/1/3/1/3/131384708/7662878.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/da3129a58.pdfIn PDF document text
    • http://wosozage.mypressonline.com/how_to_read_a_company_balance_sheet.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/41273541324.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/3277346.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/gakiwakok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://tawoxigedokewu.rf.gd/small_scale_business_management_system_project.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/51511765108.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/work_systems_and_the_methods_measurement_and_management_of_work_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/student_induction_program_report.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/patonudapovejizolo.pdfIn PDF document text
    • http://rizaxofu.rf.gd/odia_sambalpuri_song_pagalworld.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/2599148399.pdfIn PDF document text
    • http://mujujum.epizy.com/interaction_1_reading_answer.pdfIn PDF document text
    • http://benamow.myartsonline.com/askep_retinoblastoma.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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 5648 bytes
SHA-256: 8d9f5d7cd1156600c2f3fa9df75e9b12e2ed22e2f243428091abec3f65e6f24c
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 14752 bytes
SHA-256: 90880a140b70795a878fe42055d2f1b4124d252a6c2d85306d26daeaeca8ec22
font_02_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 11100 bytes
SHA-256: 50172fed7dec18455ef41601d8d74282528febff4aa69a4141c05940d6940a61

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