Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81f1499c31dc1fb…

MALICIOUS

PDF

70.7 KB Created: 2021-03-20 05:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e5bcae4d68281b15307361a6bf700d0 SHA-1: b7751bbe020d083fdda1ce59ccaa118420b2426d SHA-256: e81f1499c31dc1fbdb550ddcd776de85b2506fc2627fef50ec08e7d45f2590c3
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a site disguised as a study guide, likely a phishing or malware distribution lure. ClamAV and ML classifiers strongly indicate maliciousness. The PDF_URI heuristic confirms the presence of an external URI, and the ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of malicious intent.

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://vilenefex.ru/wix?keyword=environmental+science+biodiversity+study+guide
    • https://pifonexivusefeg.weebly.com/uploads/1/3/1/0/131070190/kajej_vosifirobiruki_jexenedavogod_zumazomatur.pdf
    • http://rukunikuxajosog.22web.org/bible_commentary_apps_for_android.pdf
    • http://jobipelulimobo.iblogger.org/ruwajerobelakozuzanoz.pdf
    • https://bebabigi.weebly.com/uploads/1/3/5/9/135977904/3640794.pdf
    • https://cdn-cms.f-static.net/uploads/4452861/normal_60309e8ce0c49.pdf
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/tojifogigibej-waxoganorutiwaw.pdf
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603edeba76e35.pdf
    • http://rozowoxov.22web.org/date_sheet_allama_iqbal_open_university_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4490528/normal_5fd31815706c9.pdf
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5ff460233c5c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lovinanijorabe.epizy.com/81723474334.pdf
    • http://zigubogujivo.epizy.com/royal_adelaide_showbag_guide_2018.pdf
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_40f02a3b33ef4e85bc95600f33c49287.pdf?index=true
    • https://s3.amazonaws.com/tesodagiwor/65667734348.pdf
    • http://wawukekaxemiju.epizy.com/6098310666.pdf
    • http://xeravujowa.epizy.com/work_plan_template_excel.pdf
    • https://s3.amazonaws.com/farezelof/transformer_coordonnes_gps_en_latitude_longitude.pdf
    • http://guruwemuzotal.epizy.com/riwatoposukodomurezu.pdf
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_9591b44c839245b79647db4428a391b6.pdf?index=true
    • http://kirezizinubov.rf.gd/40072958349.pdf
    • https://s3.amazonaws.com/jumedemimo/95790210498.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_off0000d6d4.bin
7ef7abc8abdd5535ae1dcd234624f3781b162a00d599197b505ea8fd33b6cdce
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 5516 bytes
font_01_sfnt_off0000e98a.bin
f3ee688b50683d0a7d2e096d491be943dab574b3f1d9133561ac15418b0dd129
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10516 bytes