Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c75ae882b2c1bc8…

MALICIOUS

PDF

122.7 KB Created: 2021-03-20 12:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06971e2c801618603f9ac229d7bd6579 SHA-1: 7c8231b466499a2430f389c9b91a6cc90f79d478 SHA-256: 2c75ae882b2c1bc85beb101ee77275d56cae64900d134fb68414c76c0ae34e81
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains references to 'Stargirl 2020 cw' and the wkhtmltopdf tool, suggesting a lure. The primary IOC is an external URI pointing to 'xezojetit.ru', which is likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/wix?keyword=stargirl+2020+cw
    • https://cdn.sqhk.co/mimofeto/ULihnrO/layout_filter_instagram_story.pdf
    • http://komozazene.getenjoyment.net/hexadecimal_to_binary_conversion_examples.pdf
    • https://cdn.sqhk.co/veletafi/iBfgdif/romiz.pdf
    • http://motarojetox.sportsontheweb.net/27745597675.pdf
    • http://pedaxofanor.mywebcommunity.org/piano_sheet_music_free_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinezedu/74077031199.pdf
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_37db8c5a694b453babba9d9eedd39867.pdf?index=true
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_5fe79f528922469b94a69ea0e50556f5.pdf?index=true
    • https://s3.amazonaws.com/warapagefasovi/jizisobuxomikeva.pdf
    • https://uploads.strikinglycdn.com/files/bc81bcc5-c78b-471e-bac6-6a1a93544551/quanto_tempo_o_corpo_leva_pra_entrar_em_cetose.pdf
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_303faca7073b4fe7934d318d671ac7e6.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_3cab964b847d41d0b56a8753551d351d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6acb8a8d-e6bd-4118-9277-9ab841e0adcd/how_to_write_alpha_symbol_in_latex.pdf
    • https://s3.amazonaws.com/zumomasugipeno/nemedekijefoz.pdf
    • https://s3.amazonaws.com/kovezux/28709912619.pdf
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_96fea072cbfd43bc997b04d22ba9eb53.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25cfa3c0-6ee8-44bf-a571-4a8cb771a90e/feelings_faces_worksheets.pdf
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_061e0acb95284368ac23bb0c1818cedf.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_36e21f074b8a40a986c201029bdd83ba.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_off0001a326.bin
79d198095eb80837010e2ac8bed799578caa76ccf6f43cdc7f7631b24ef748d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A326 5260 bytes
font_01_sfnt_off0001b528.bin
e828820f1917b2a5bdc1dfc7a5e5ac31ddf3b1527e491c5152dfeb8e31f4f29f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B528 11244 bytes

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