Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b384f8a8481dbbc…

MALICIOUS

PDF

67.0 KB Created: 2021-03-28 05:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033b7ffd7ef0a0e98d43100faca6f663 SHA-1: d390937e0bbb07cf0fa48267086b65bbb04a0154 SHA-256: 2b384f8a8481dbbc4b6013dbbf8e0f0a9b3f152c98c102386551d04a72969562
96 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs, one of which points to a suspicious domain ('golowaki.ru'). The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'noun clauses quiz pdf' or an 'award', which is a common phishing tactic. The presence of embedded URLs and the nature of the detection suggest this file is likely part of a phishing campaign or a malware distribution effort.

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://golowaki.ru/award?keyword=noun+clauses+quiz+pdf
    • http://kyukty68.xyz/xujaji3dni.pdf
    • http://silujokiz.mypressonline.com/icar_biology_syllabus_2020.pdf
    • http://aicberg.net/how_to_unlock_ipod_touch_icloud_activation_lock16qf9.pdf
    • https://cdn-cms.f-static.net/uploads/4425909/normal_6041176f139bc.pdf
    • http://copyrightproblem.com/personal_questions_to_ask_a_guy_about_his_pasts00nx.pdf
    • https://cdn-cms.f-static.net/uploads/4410965/normal_600f509457baa.pdf
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fe3c1f1b3dff.pdf
    • https://cdn.sqhk.co/sijoputolu/ShhM6O6/36940042455.pdf
    • http://kodavuviguwu.mypressonline.com/business_english_handbook.pdf
    • https://cdn.sqhk.co/gusiloxi/hewPgh2/37966934621.pdf
    • https://cdn-cms.f-static.net/uploads/4402932/normal_6050c6cd8d77e.pdf
    • http://mosebuzixat.mywebcommunity.org/lamogabulalowonaroda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pexirud.onlinewebshop.net/rod_of_seven_parts_adventure.pdf
    • https://s3.amazonaws.com/vuterijoze/political_philosophy_definition.pdf
    • https://s3.amazonaws.com/pewebopufupe/zagogo.pdf
    • https://s3.amazonaws.com/sorogamat/what_operations_management.pdf
    • https://s3.amazonaws.com/jujojomojemiz/77212332658.pdf
    • https://s3.amazonaws.com/sugosubexez/m._c._h_in_blood_report.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_da6368e3392c4919af73c24000104bee.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_c803bb1b306a462dbfdd0a39932860f7.pdf?index=true
    • 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_off0000c7ba.bin
43c183de9a2b02a4a435c0f56ec934b2e48ea539842c2132e8db93e43aca0f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 5196 bytes
font_01_sfnt_off0000d98d.bin
6a40533748b038fa44070f907c6ff50ac11f48aedb48aa28e82ab846e649486d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10644 bytes