Malicious PDF — malware analysis report

Static analysis result for SHA-256 8741f5399bfc38ae…

MALICIOUS

PDF

66.9 KB Created: 2021-03-22 22:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b420e97670afe4498d977b859f4698fc SHA-1: 2de9bb5a03678db9d92af023cdc61196933f2bf5 SHA-256: 8741f5399bfc38ae66598f6a7342502d131052a849803c7192559a98ac4e6b5c
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs to a domain associated with malicious activity, disguised with keywords related to 'Osage community schools facebook'. No scripts were extracted, but the presence of the malicious URL and the strong heuristic detections indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=osage+community+schools+facebook
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fc89b13e10af.pdf
    • https://static.s123-cdn-static.com/uploads/4464734/normal_60094f0ef2f59.pdf
    • https://static.s123-cdn-static.com/uploads/4443292/normal_600158d22b00c.pdf
    • https://cdn-cms.f-static.net/uploads/4488604/normal_604edea4a1fb0.pdf
    • http://pojapusevipuzu.mypressonline.com/basic_english_speaking_course.pdf
    • https://static.s123-cdn-static.com/uploads/4491688/normal_6001f0dcb7501.pdf
    • https://cdn.sqhk.co/xeloxilava/ahdv8ic/9922715139.pdf
    • http://kozoperog.iblogger.org/52967939531.pdf
    • https://cdn-cms.f-static.net/uploads/4455380/normal_604d4562445bd.pdf
    • https://cdn.sqhk.co/xolofiwano/Dt9hbyQ/6642323896.pdf
    • http://gonugotez.22web.org/cloud_atlas_sextet_sheet_music.pdf
    • https://cdn.sqhk.co/fabunavaxa/Khepojb/woxamu.pdf
    • https://cdn.sqhk.co/filemowa/OVhiijv/64241839735.pdf
    • https://cdn.sqhk.co/lafixafif/gjapohe/zepeto_blackpink_app_download.pdf
    • http://xujofalidubof.iblogger.org/tidowobudafonepi.pdf
    • https://cdn-cms.f-static.net/uploads/4427509/normal_6016f001d9b11.pdf
    • http://gugolufixa.mywebcommunity.org/pca_notes_on_aci_318-14_building_code.pdf
    • http://rejuxipo.iblogger.org/pakudaledivosuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dadewom.epizy.com/16432801955.pdf
    • http://zarevamemamafo.rf.gd/jemawudejezumuk.pdf
    • http://sojizodujibibo.epizy.com/not_funny_didn_t_laugh_dk.pdf
    • http://nanojali.epizy.com/building_construction_drawings.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_off0000c836.bin
b892bb62dd7005c61128e0fd6e77c3b656bf801422e0cc9bcd1fd1dec1eac50c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 5532 bytes
font_01_sfnt_off0000daf2.bin
eb08b4be6bcb6d4019c4b009df240db478fb96859e398b2ec6693d5dbc3414ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 10104 bytes