Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b46aaa576e92b32…

MALICIOUS

PDF

79.6 KB Created: 2021-04-01 06:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ead87f427037ee1b215530bf90f1ecd SHA-1: 7eaa13a7d700e710c6908f77380648dc814d2a0a SHA-256: 4b46aaa576e92b3242479a38add4dcdad7354afe89bb350b5ec28694d8103d72
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'practice answers', a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=8-1+additional+practice+answers
    • http://fozixozag.iblogger.org/marantz_sr5009_factory_reset.pdf
    • http://cetapp.xyz/89457593304abxpg.pdf
    • http://drovazvenigorod.ru/55130650730cu365.pdf
    • http://rilomenininun.getenjoyment.net/bengali_magazine_file_download.pdf
    • http://potasofan.iblogger.org/gubozobisowagexubepifi.pdf
    • http://zagesevava.iblogger.org/turudiwap.pdf
    • http://nokojatagi.mywebcommunity.org/86342731550.pdf
    • http://bagagapesum.22web.org/new_malayalam_movie_free_sites.pdf
    • http://umdtheatre.ru/como_homologar_titulo_bachiller_en_espaaxz95k.pdf
    • http://jopkapopka.online/sales_force_automation_in_crmldsmw.pdf
    • http://rezanufeku.mygamesonline.org/dedaxewirimaxesoler.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_ecf98c77c0264bfbbde627b393255e88.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_575f147f90594eff8c052df6885696a4.pdf?index=true
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_f3a932bfacbd460cbb6b17bd2bc4c601.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01e67ffd-3515-4e44-b851-1ac94fcd6286/flir_tg165_vs_flir_one_pro.pdf
    • https://uploads.strikinglycdn.com/files/6f00bbdb-3427-498a-ba6a-ae55abff0235/82338868191.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_f8a6c1d875044f099515ba9177039401.pdf?index=true
    • http://fiforeru.atwebpages.com/cutting_edge_book_pre_intermediate.pdf
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_a36433f5feca42bda2a54060e5c054c2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6f2e6a2d-a703-461f-a1b7-ab30bd5539cc/speak_book_club_questions_for_educated.pdf
    • https://uploads.strikinglycdn.com/files/88357b91-ff26-4e63-9e77-a8269b116ea2/brother_xl_2600_tension_problems.pdf
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_797d7d3a3e3d4b35a4ceb34365472e43.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_off0000f942.bin
9d4b563bbbe7c3798897d8f6dd81dc323763aadd58f60ca29e1714f068cb0a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 5344 bytes
font_01_sfnt_off00010b93.bin
fc80dc71df722bdf85f4087ad72a8f992842c987fd4dd0d0fab6772bd8ebf3a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 11048 bytes

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