Malicious PDF — malware analysis report

Static analysis result for SHA-256 e877578074d42fe2…

MALICIOUS

PDF

72.9 KB Created: 2021-03-16 04:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c35509cb0261c37e2754a5779de858d SHA-1: 93d1026b629933698c26b51af0453b741640c219 SHA-256: e877578074d42fe24adef748383cb915538deac544f3d0813fca4a353a7511bd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external links, including one to 'vilenefex.ru' which appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a context of 'word problems worksheet', indicating a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=joint+variation+word+problems+worksheet
    • https://cdn.sqhk.co/sifalavuxozo/gcKiege/ganowuxatope.pdf
    • https://cdn.sqhk.co/susotizakaxe/hfujijd/pozatoxumarixigopije.pdf
    • https://cdn.sqhk.co/vojazodelud/MgLeWhg/nemesis_of_the_roman_empire_maps.pdf
    • https://bejuzozomixur.weebly.com/uploads/1/3/5/9/135966319/joluze.pdf
    • http://idealicaitalia-ufficiale.site/diccionario_biblico_cristiano_reina_valeratxott.pdf
    • https://cdn.sqhk.co/noxivudeva/jyhfDLD/black_love_stories_on_hulu.pdf
    • http://yazansoft.com/ansible_and_extractwymg2.pdf
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/cd700e8d.pdf
    • https://cdn.sqhk.co/xedogigiloli/KRViigf/63550117131.pdf
    • http://the-job.ru/cantaloupe_island_bass_sheet_musicqhi3l.pdf
    • http://sayfelengs.space/lfs_5_kol_jant_yamas_indirtobuy.pdf
    • https://cdn.sqhk.co/vaminika/Vchahjp/79238128583.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zupenafud/nopalia_churritos_informacion_nutricional.pdf
    • http://lelexuxifu.epizy.com/cold_rolled_sheet_thickness.pdf
    • http://tivapatovike.epizy.com/vulivolewofipepedis.pdf
    • https://s3.amazonaws.com/jeduzizonox/zefil.pdf
    • https://s3.amazonaws.com/tutapaxi/best_cv_template_2019_uk.pdf
    • https://s3.amazonaws.com/timeziso/ludarujanazofelexuz.pdf
    • https://s3.amazonaws.com/dowadotiju/93420023985.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_off0000deef.bin
bbd40f9a70e8fe1984f7d5bd55f58ad74dbbbdf03ed65e19efed7f92a08a855e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 5544 bytes
font_01_sfnt_off0000f1ac.bin
4070d68f8dd1515a7ed35276d3518f27ed5db7d8f7b9da99d528fb8d154563a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 10800 bytes