Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c20687fe9b53c0…

MALICIOUS

PDF

72.7 KB Created: 2021-03-17 05:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68bc6dc975db5893d378af18ed2262e6 SHA-1: b63cfd2938a40a0bb1c2f8cea762db06e6611e1b SHA-256: 17c20687fe9b53c02ab50a72a7d55e3344f6b1d4a5bec6d1c529b1a13fd11cb4
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://golowaki.ru/123?utm_term=triangle+interior+angle+sum+theorem+worksheet', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a worksheet theme, which is a common lure for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=triangle+interior+angle+sum+theorem+worksheet
    • https://cdn-cms.f-static.net/uploads/4427504/normal_600e024de2208.pdf
    • https://cdn-cms.f-static.net/uploads/4495039/normal_6041c5cf5ee2d.pdf
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/4b5af3.pdf
    • http://tikonazab.iblogger.org/how_to_read_court_case_numbers_washington_state.pdf
    • https://cdn-cms.f-static.net/uploads/4450351/normal_5fe843832609f.pdf
    • http://bewujasixi.mywebcommunity.org/85535630584.pdf
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fd728445531c.pdf
    • http://xepidenad.scienceontheweb.net/news_report_examples_ks2.pdf
    • http://rapoxarawiwalo.sportsontheweb.net/paradise_lost_book_10.pdf
    • http://tekesonisopo.22web.org/modern_certificate_template_editable.pdf
    • http://vowubomirasupem.22web.org/wearable_king_crown_template.pdf
    • https://pajixuga.weebly.com/uploads/1/3/2/3/132303126/054e400ecebbd.pdf
    • http://kilabisito.iblogger.org/61881126814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wexugemo.epizy.com/47253748732.pdf
    • http://kujazidi.epizy.com/38045320675.pdf
    • http://bamanitetazokav.rf.gd/72557364411.pdf
    • http://duvodix.myartsonline.com/dyson_vacuum_dc50_troubleshooting.pdf
    • http://siniligavaxuvul.onlinewebshop.net/free_ebook_reader_for_windows.pdf
    • http://jetetejev.rf.gd/11769016146.pdf
    • http://vuzinibijabu.rf.gd/beiman_priya_all_song.pdf
    • http://tuvalej.epizy.com/90649565712.pdf
    • http://dejamatokato.rf.gd/73183193810.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_off0000de30.bin
3fc37c10c02c4e5bafba5f71a1311bad07ea427fe92e19a791ebfbbc94ea3403
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 5204 bytes
font_01_sfnt_off0000efc9.bin
0719b6dc31188532d6625ab6e429bca58a56d1ec1c88fc7dea3b7527b3abaf9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 10388 bytes