Malicious PDF — malware analysis report

Static analysis result for SHA-256 5123b4b91d90b12a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 08:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a8b2e818a05511f9a1a4a2a371cb87 SHA-1: 1acd36ab9ff04391316afee43b684636ba79724f SHA-256: 5123b4b91d90b12a6f45876a28b059cbb6ecdd66b38b76acbfd9835d727f9c0b
96 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with the primary one being 'https://zajinet.ru/strik?utm_term=dilations+five+pack+worksheet+1+answers'. This URL, combined with the heuristic firing 'ML_NYX_PDF_MALICIOUS' and ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', strongly indicates a phishing attempt. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=dilations+five+pack+worksheet+1+answers
    • http://bilet-pdd.site/wurosevesofxiigm.pdf
    • http://mawolezodotuxu.iblogger.org/guwej.pdf
    • http://sexesex.site/whole_language_teaching_method7udv0.pdf
    • http://momijuluxesapek.iblogger.org/date_sheet_of_12th_class_2020.pdf
    • http://apsdd54gfv.xyz/zagopuranikokorukosezef647d.pdf
    • https://fuzonigeli.weebly.com/uploads/1/3/0/8/130813785/magajokegudug_wepaze_jaboz_naxipu.pdf
    • http://qlemelest.online/1484355927bsn71.pdf
    • http://banquepopulaire-fr.org/best_skills_for_blitzer_blood_bowl_2s86vz.pdf
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/vepalodutikawa_weliginebe.pdf
    • http://bcipreactivaperu.com/what_is_the_english_meaning_of_movies9ahkk.pdf
    • https://cdn.sqhk.co/bixatavafut/hh7jceg/22155384606.pdf
    • http://stingeksoj.online/902962584622d7x5.pdf
    • https://cdn.sqhk.co/zinumazak/hjhijbi/93522889963.pdf
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/cf0144a248d4c.pdf
    • http://sodobinefudiguw.iblogger.org/will_cyberpunk_2077_look_good_on_xbox_one.pdf
    • http://mebelintera.ru/99840555353fypql.pdf
    • http://poroda.site/dxcpl_directx_11_emulator_download_wdvdyc.pdf
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/zogufidewo.pdf
    • http://nuraner.iblogger.org/how_to_change_battery_in_genie_remote_gict390.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kiwasebax.epizy.com/89763784608.pdf
    • http://bekokutiwafodi.epizy.com/the_fork_the_witch_and_the_worm_volume_2_release_date.pdf
    • http://bezepegu.epizy.com/76920257869.pdf
    • http://wozaloruwogilo.rf.gd/the_non-designers_design_book_4th_edition.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_off0000f148.bin
4e97ac1a1221e7609990bcd077187d6fca75d0f881f94897d4a2831e26279ce9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 5372 bytes
font_01_sfnt_off000103af.bin
77ac09effa6d6a25b13e30f836e4165a8251cf53840fac1846e2e433d7c4c843
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10196 bytes