Malicious PDF — malware analysis report

Static analysis result for SHA-256 8366a8e1821ad90c…

MALICIOUS

PDF

72.9 KB Created: 2021-04-05 07:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ba275d284aefd9c70fb1dd40b7c7e6 SHA-1: dba5f7f1ccd1210fa836ccab3a9655a1e4b33686 SHA-256: 8366a8e1821ad90c43b43bdeaf7678ed9662435ca0156fcc18bf4f6e358fa2df
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that, when accessed, redirects to a malicious domain. The document body, though heavily obfuscated, suggests a lure related to an 'English grammar workbook'. The presence of an external URI and the ML classifier's high confidence score indicate a phishing attempt designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=ags+basic+english+grammar+workbook+pdf
    • https://cdn.sqhk.co/jurufovowufu/Rxthfgc/52738660891.pdf
    • http://sunazuwu.iblogger.org/salesforce_admin_certification_study_guide_2020.pdf
    • http://napowojeba.medianewsonline.com/saxon_math_algebra_2_answer_key.pdf
    • https://cdn.sqhk.co/nogegamapagi/jhBLZ69/flashlight_on_iphone_11_not_working.pdf
    • https://cdn.sqhk.co/vekuperik/folibNU/ticket_to_ride_cost.pdf
    • http://rolapisi.scienceontheweb.net/lotavitekulumavedupixag.pdf
    • http://tilosag.mypressonline.com/anatomy_and_physiology_of_eye_book.pdf
    • https://cdn.sqhk.co/tononapiwaso/UifRjjI/88713769461.pdf
    • https://cdn.sqhk.co/gogerazina/QjaVYia/descargar_ultimate_soccer_football_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://modurogodolu.epizy.com/classroom_rules_template_printable.pdf
    • http://pudolajuji.atwebpages.com/natere.pdf
    • https://s3.amazonaws.com/kukazowox/fifty_shades_of_grey_series_goodreads.pdf
    • https://s3.amazonaws.com/futamo/bazejesawanemisamidal.pdf
    • https://uploads.strikinglycdn.com/files/0b616ebe-a6fe-4520-a1e6-1a09d07c6e12/twilight_stephenie_meyer_new_book.pdf
    • http://mumewizisuwored.epizy.com/atkins_physical_chemistry_10th_edition_solution_manual_download.pdf
    • http://bimejevitugera.epizy.com/204811897.pdf
    • https://uploads.strikinglycdn.com/files/c99ff59c-4d68-4351-9266-094adcd2167f/saeco_espresso_machine_xsmall.pdf
    • http://kobizesamow.rf.gd/cfa_institute_research_challenge_report_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d096.bin
012d85b1ff0e80e7c00f6ad3ca97c343fa83daac64aee0a3a6ae5a5fdd33a3c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 5560 bytes
font_01_sfnt_off0000e34a.bin
513acf5f896ba32396b261f775e91cb3dd89c19bf5b57cc0072437c69ce5e135
pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 11004 bytes
font_02_sfnt_off0001086a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 4324 bytes