Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21a8a8a16ae65d6…

MALICIOUS

PDF

64.5 KB Created: 2021-02-11 01:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e8bb6cd1163fd71b24b12ab395c29ab9 SHA-1: a6d28cd0596da9ec5e14221d31df24bca0612e6d SHA-256: e21a8a8a16ae65d6fecfcfe12dfc5b725c76a86da626c04250515c0e2ae68bba
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be related to a worksheet, suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=chapter+7+magnetism+and+its+uses+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/busosuwik/Wy5whhd/vimegigib.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/c1ihtjj/foputedabodaravozijodane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_6005eb087a80e.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/ji4gjAX/truck_craft_bodies.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jf1jey2/assassin_s_creed_identity_apk_obb_free.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/jIfifLb/xesimetalopuwekiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_600bc947538e4.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/ay2hijg/tupodetifige.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/ijWjjh4/rock_climbing_walls_near_me.pdfIn PDF document text
    • http://filopibat.22web.org/best_android_emulators_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6020a5ee2e23d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakusineba/new_bhojpuri_dj_song_2019_free.pdfIn PDF document text
    • http://fonobufusig.rf.gd/envato_elements_word_template.pdfIn PDF document text
    • http://nodafawujanego.rf.gd/date_format_php_am_pm.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC139 5484 bytes
SHA-256: 696746980dd45c1e471af45fcd5abe304e8355500a3e7b5249ba641c448b815b
font_01_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 9748 bytes
SHA-256: d445b203658fd3c3142cc5aeaac48ce33e689f2d427efeb90e45b0afd9584556