Malicious PDF — malware analysis report

Static analysis result for SHA-256 780f108a08040b9d…

MALICIOUS

PDF

86.5 KB Created: 2021-03-16 00:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd687eb6e0b34030385e0dcf673172f SHA-1: d01cbcd52e9b44ffc7e06ecd0681750da1d9ef67 SHA-256: 780f108a08040b9de20fc9d4e5287d561e8df57ff637af9fecf5dcb4d0c83021
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by a ClamAV signature and an ML classifier. It contains an embedded URI pointing to a URL that appears to be a lure for downloading educational materials, likely to disguise malicious intent. The PDF structure itself is also flagged for duplicate object bodies, which can sometimes be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=basic+electrical+engineering+mcq+pdf+download
    • http://dusefibesix.iblogger.org/meconium_aspiration_syndrome.pdf
    • http://tajevis.22web.org/seredomodiwufoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f42b4527-c1fb-4fb1-9ef8-ba8dee0d3a05/best_how_to_draw_books_for_7_year_olds.pdf
    • http://jowanesivokadeb.rf.gd/avalon_hill_civilization_rules.pdf
    • http://zozezofi.rf.gd/afman_17_1203.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/elevator_pitch_template_for_job_seekers.pdf
    • https://s3.amazonaws.com/rewepalazamiso/reporting_effect_size_correlation.pdf
    • https://s3.amazonaws.com/jalasilunaz/38346714934.pdf
    • https://s3.amazonaws.com/bojafazes/best_sql_formatter_sublime.pdf
    • http://korobuvorudetiv.rf.gd/how_to_unstack_frigidaire_washer_and_dryer.pdf
    • https://uploads.strikinglycdn.com/files/2b966962-384c-4adf-ae88-c91f97b0cfd3/the_awakening_kate_chopin_book_review.pdf
    • https://s3.amazonaws.com/zerepuzuze/7918150823.pdf
    • https://s3.amazonaws.com/sojebelevenex/taviguxanowub.pdf
    • https://s3.amazonaws.com/zuses/ishares_uk_property_ucits_etf_fact_sheet.pdf
    • https://s3.amazonaws.com/lanaladu/copy_sheet_trong_excel_2016.pdf
    • https://s3.amazonaws.com/tevigotu/94634335881.pdf
    • https://s3.amazonaws.com/galinikagopit/you_can_find_the_requested_information_below.pdf
    • https://s3.amazonaws.com/wujodibu/ertalon_6pla_data_sheet.pdf
    • https://uploads.strikinglycdn.com/files/0b811945-e2f3-46f0-bc89-a08779f123b0/71820707035.pdf
    • http://gukominutokowu.epizy.com/vejukezate.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_off000110ef.bin
9637c3996c89bdc6331781cdc121622a49fc2ecb195e7879ff82a6096275bc07
pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 5744 bytes
font_01_sfnt_off0001246c.bin
151f6b2d71e50fda5ab88b5993ca03111d2c9f8108482d71f9eb831c04db4513
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 11636 bytes