Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3afc4f066a06a2f…

MALICIOUS

PDF

95.8 KB Created: 2021-03-18 21:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8ba55b20b0f3e66335de9e67717edb SHA-1: d00697510affbbf3341833e113bb006ca47e9245 SHA-256: c3afc4f066a06a2fa998485f81d22e044fc9e18348ecb3120ed29686b368da0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://xezojetit.ru/123?utm_term=arabisch+alphabet+pdf', are likely used to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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/123?utm_term=arabisch+alphabet+pdf
    • http://anyita.space/pakigexovudarakekisikuj2tq08.pdf
    • http://zakozoxutujo.22web.org/78829769617.pdf
    • http://50offit.pro/que_es_titulo_azul_en_mxicowlape.pdf
    • http://sepuwazedano.iblogger.org/1698323209.pdf
    • http://rexirututesopew.iblogger.org/14876074481.pdf
    • http://wwbook.org/aloha_browser_apk_uptodown0zr7s.pdf
    • http://ig-copyrighthelpcenter.com/31178353930gve1n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/103bfcc6-2137-4561-b244-5b1bea0b109e/pilodo.pdf
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_b954847176f24389a7acca9a3bacb398.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5774957f-4fba-4fef-b94b-aea97c0744ca/excel_formula_if_cell_contains_text_then_count_another_cell.pdf
    • https://uploads.strikinglycdn.com/files/c9568d83-db21-4b22-9c19-c68748402026/18725259366.pdf
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_e8d91baf7db04aa29bbff860c2fa0ed0.pdf?index=true
    • https://s3.amazonaws.com/fonibinaraj/absa_app_for_ipad.pdf
    • https://s3.amazonaws.com/kesumasaka/23565076829.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_fab9374c9e194904bf2068f494d0916b.pdf?index=true
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_d234aed179664090b8844ecab3c85107.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b3452c1-ea73-48a0-9622-8b0f703a23ca/sig_p938_sas_in_stock_for_sale.pdf
    • https://s3.amazonaws.com/mukut/when_does_the_wu_tang_series_come_out.pdf
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_44ea711150d34a2fa3381cb8f9d24cec.pdf?index=true
    • http://xonukekavufimil.epizy.com/bdo_archer_aakman_guide.pdf
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_2a42f846cde34179a723b83938fe8f83.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ecb9d047-297b-45e2-b88f-f9ac5bc8214a/batulatawiwad.pdf
    • https://s3.amazonaws.com/setikizo/crnica_de_una_muerte_anunciada_espaol.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001394a.bin
a02e0c6e31d4d404c5167c3eba4ce8f9c4f211aee0987f31e1f928a7678b1521		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1394A 33836 bytes
font_00_sfnt_off00010048.bin
7ac3c31f330a11e4426ef8b9163a546c1eb16af989c808c575dd417c811c9a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 5372 bytes
font_01_sfnt_off00011280.bin
65909a569c617e08db5cabd2fac7074a4f5b888a68ec862c53a04303cbc593e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 11844 bytes

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