Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdf65bb6f069a4e…

MALICIOUS

PDF

78.1 KB Created: 2021-05-20 12:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 541a274a19adbdf2d511e617660c65e0 SHA-1: e2595e21ea8684ea8a7ee2a82e771648ee0e0494 SHA-256: 8cdf65bb6f069a4ebdb3235a36e4ee6ad705f1d73880751ae9290aaaa50a6173
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the presence of an embedded malicious URL in a PDF document is a common tactic for delivering second-stage payloads or redirecting users to phishing sites.

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://botokaw.ru/strik?utm_term=monster+legends+mod+apk+unlimited+everything+2018
    • https://cdn-cms.f-static.net/uploads/4369509/normal_605d95f784ee0.pdf
    • https://cdn-cms.f-static.net/uploads/4479673/normal_5fd7bfc14f29f.pdf
    • https://cdn-cms.f-static.net/uploads/4404753/normal_606b8e9de0267.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_604a4300bdf11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1ed43b18-8241-4c8c-ba67-b883bdbf4430/mame4droid_0.139_u1_full_rom_set.pdf
    • https://uploads.strikinglycdn.com/files/7d6d6d57-411b-44a3-8c76-a6e10f656638/how_to_say_hello_sign_language.pdf
    • https://uploads.strikinglycdn.com/files/2af6dfd9-e866-40bc-8583-066ccdda755d/cursos_gratuitos_de_marketing_digital_2020.pdf
    • https://uploads.strikinglycdn.com/files/352ccc26-a554-4b20-a8bc-cc13d36ede42/wedusodivakewipobojotewed.pdf
    • https://s3.amazonaws.com/zulezov/free_fingerstyle_blues_guitar_tabs.pdf
    • https://uploads.strikinglycdn.com/files/24eba9bc-4040-4319-b12b-4dbfa9d95222/what_happened_to_ron_and_hermione_in_the_cursed_child.pdf
    • https://s3.amazonaws.com/dutuzanob/xerukaxaregosemiga.pdf
    • https://uploads.strikinglycdn.com/files/d0920154-c139-4c9d-abff-937b64611f81/wakiregorogemerokode.pdf
    • https://s3.amazonaws.com/patotale/process_writing_worksheets_for_class_8.pdf
    • https://s3.amazonaws.com/penale/vazosudev.pdf
    • https://s3.amazonaws.com/dopugaxelelema/swagger_like_us.pdf
    • https://uploads.strikinglycdn.com/files/5d29eb3d-e6af-431e-ae12-7678c85e461f/how_to_make_a_soap_dispenser.pdf
    • https://s3.amazonaws.com/muxegeza/present_tense_words_list.pdf
    • https://s3.amazonaws.com/kopisigapub/interview_in_english_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cf.bin
4f75dda0275eeee6209f0d589de3cc06635fc3cc7d8d26b03bcb4294a5a9fb3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 6864 bytes
font_01_sfnt_off0000efbf.bin
c0c18d5f526a8ea0643b560c204e6e4422a26033cf12229159df6f987e465349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 6124 bytes
font_02_sfnt_off0001047d.bin
a6f2a285bbc575f01d5630cce5caa3bc4c4caef0bcdf1403d52062f24c5905bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 11488 bytes

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