Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6431a97634173c…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 15:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d36522dd888ecf134a5ef78155ef87c SHA-1: 5cdcbac68407e8a3076bb14c940c250be5a5e57d SHA-256: 9a6431a97634173c63733d874681916af04029a3ab33d82eea8c1bc8542350f0
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. The presence of an external URI pointing to a suspicious domain, combined with numerous other unknown reputation URLs, suggests the document is designed to trick users into downloading further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, potentially part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/award?keyword=aisd+calendar+2020+18+pdf
    • http://gitamoravazini.22web.org/answers_on_a_postcard_cocktail.pdf
    • http://ruluzuzadol.mypressonline.com/87821064427.pdf
    • http://requiremcgood.com/dakesotisuxumutuwax0bwb7.pdf
    • http://micrometer25bill.site/vafotuwujugotawodtczkz.pdf
    • http://zumbayuliya.online/will_2020_be_a_good_time_to_buy_a_housezxxdw.pdf
    • http://shop50off.info/biwizoruxuverarewn3.pdf
    • http://idealica-ufficiale.site/muwinavaseboxamevijojiph8pgg.pdf
    • http://mixutadumekaje.mypressonline.com/lopemovaloloneg.pdf
    • http://fitokapss.xyz/stars_slots_free_chipsowqtq.pdf
    • http://reduslim-buy.site/how_to_learn_chinese_charactersxzts8.pdf
    • http://tadosuzewamu.medianewsonline.com/75335651480.pdf
    • http://community-day.ru/57883334527xwngr.pdf
    • http://zanovekolasin.mywebcommunity.org/beach_fishing_rigs_uk.pdf
    • http://xajekuk.22web.org/easier_to_read_pro-106_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_c6948d5dfa544af2adad90630747fda4.pdf?index=true
    • http://madukavinoxonal.epizy.com/languidez_sinnimos_y_antnimos.pdf
    • http://fizoluzakazuxaw.rf.gd/91403615812.pdf
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_b0340b4a89564a7b860bf36890e7c639.pdf?index=true
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_da21df448244468ab51a2da8c2db9b42.pdf?index=true
    • http://zimemotom.rf.gd/personal_development_plan_objectives_sample.pdf
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_a1dcb1cc158d45f1b4336fe5d65768e3.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_0cdf0718849b4f1b920d3ffee292a958.pdf?index=true
    • http://matewedidoxeber.onlinewebshop.net/gilasuwuvajilolekabun.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_off0000f8b7.bin
c1ad5c212070eaae846d4dcd4cbae5081bb0b7e567a0681c1392354aadaa423e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 5660 bytes
font_01_sfnt_off00010c11.bin
e2519ac94ba8df2648e6a9a6bea442042fa327603f963f152a82bd0e1f3b3e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 10992 bytes

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