Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cbcd7dc709b4c4…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 13:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5b9471927d2fa0c20f70d7c4b2c4daf SHA-1: 7939308524b01697f7598d367756052b7018a1a4 SHA-256: a1cbcd7dc709b4c41224e887b9e063799458ca6001569b3bb2b661c1af229bac
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, 'botokaw.ru', which is likely used to host a phishing page or a second-stage payload. The document body is heavily obfuscated, but the presence of external URIs and the high risk score suggest a malicious intent to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/wix?keyword=at+the+beauty+salon+word+whizzle
    • https://cdn.sqhk.co/tizesefetus/UfhcKia/beat_the_buzzer_game_for_sale.pdf
    • https://cdn.sqhk.co/xorilulog/ghgf2ge/talking_tom_cat_game_free_download_for_mobile.pdf
    • https://cdn-cms.f-static.net/uploads/4421464/normal_601ffdf82cdb4.pdf
    • https://cdn.sqhk.co/gepeduvo/bhgjfJi/slide_away_oasis_demo.pdf
    • https://cdn.sqhk.co/letinumi/tKt1ij0/vedematalelozoran.pdf
    • https://cdn-cms.f-static.net/uploads/4452834/normal_6021ebf49b15c.pdf
    • https://cdn.sqhk.co/zimidenex/cjrB11f/dexalupisepakar.pdf
    • https://cdn.sqhk.co/fosojatesog/iIsiija/kafaxekixegoxekix.pdf
    • http://zomoxoxuriw.mypressonline.com/high_frequency_oscillatory_ventilation_in_neonates.pdf
    • http://nuloriwilorij.scienceontheweb.net/52977661851.pdf
    • https://cdn.sqhk.co/kikepedu/2mXgjgc/sizumu.pdf
    • https://cdn.sqhk.co/pazaxefuma/bgcjggd/13869563014.pdf
    • https://cdn.sqhk.co/wepiwojeta/eKYgjQK/supplementary_definition_math_example.pdf
    • http://fuvesozufinefi.medianewsonline.com/bringing_words_to_life_beck.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/268b2067-9e73-4084-8861-565de7742c8a/renawatofuwiduku.pdf
    • https://uploads.strikinglycdn.com/files/49f83803-6117-42ee-a35c-d2a4ae302265/positive_clear_blue_digital_but_negative_first_response.pdf
    • https://uploads.strikinglycdn.com/files/be0c7b38-ad13-4516-8f26-2aa7d553091c/which_water_flosser_reviews.pdf
    • http://joberemig.atwebpages.com/18243606732.pdf
    • https://uploads.strikinglycdn.com/files/d20656a5-7eda-4d0c-88c9-65721384e4a1/32171256532.pdf
    • https://uploads.strikinglycdn.com/files/f9d210bd-0385-4381-a882-edde88dedba9/how_to_properly_charge_nimh_batteries.pdf
    • https://uploads.strikinglycdn.com/files/dbac7193-bcc7-446b-b200-16f454339b95/493906521.pdf
    • http://moxuzaridob.onlinewebshop.net/back_to_school_night_parent_sign_in_sheet.pdf
    • https://uploads.strikinglycdn.com/files/d30267ed-c07b-4795-9ba9-0a65b702727b/80732563773.pdf
    • https://uploads.strikinglycdn.com/files/61e8cd07-e863-4287-954c-303cb28e7e5c/what_quran_says_about_jihad.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_off0000f591.bin
21626289f5704ea646e941abb7e7d2c812dbac12f3193297f276dd70d1eaa7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 5288 bytes
font_01_sfnt_off0001079d.bin
f628d6fb28033e8bd4b71fd5886039634cc41f3574b39abb08b097e588716482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10864 bytes

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