Malicious PDF — malware analysis report

Static analysis result for SHA-256 9942a9e6e1e9d25e…

MALICIOUS

PDF

95.9 KB Created: 2021-06-10 10:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c00d92ee3a3cc9eb4bec884dd865087 SHA-1: 7e1a061f4799e606b1d6fd77519c9d2c8f6c47ab SHA-256: 9942a9e6e1e9d25e32e62511dd86f0a811a69b4f1ab56307f92019ec62acce8d
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to trick users into downloading a password-protected archive, likely containing malware. The embedded URL points to a domain that appears to be a redirector, further supporting the phishing and malware delivery intent. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://synerhu.ru/pbw?utm_term=the+basketball+diaries+full+book+pdf
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/dd2f560a4de.pdf
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/7866454.pdf
    • https://gafibuludumogid.weebly.com/uploads/1/3/1/4/131453415/8fb44c15076308.pdf
    • https://dekudabor.weebly.com/uploads/1/3/4/8/134893804/fizigowaposapip_widanas.pdf
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/819d4b358e85cb2.pdf
    • https://padabomax.weebly.com/uploads/1/3/4/6/134681696/fee29604b3ff5b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/49f8e332-7706-4bbf-b5d8-7480307d566c/44201516281.pdf
    • https://uploads.strikinglycdn.com/files/80ac3541-0c05-451b-a1e9-108d606730b7/how_to_make_a_creeper_farm_1.16.pdf
    • http://mujefapufefi.pbworks.com/w/file/fetch/144621777/what_are_the_3_different_reading_techniques.pdf
    • http://zevatirupura.pbworks.com/w/file/fetch/144677406/cecelia_ahern_ps_i_love_you.pdf
    • https://uploads.strikinglycdn.com/files/cbe591ce-6213-443b-813d-b6db687947a6/29521672297.pdf
    • http://barumena.pbworks.com/w/file/fetch/144445074/35083726230.pdf
    • http://negovijalulu.pbworks.com/w/file/fetch/144579231/taxutulupegodufejemugel.pdf
    • http://fiseguxu.pbworks.com/f/coraline_pelicula_completa_en_espaol_parte_1.pdf
    • http://mulasamesi.pbworks.com/f/clash_of_clans_th11_farming.pdf
    • http://javefanudosa.pbworks.com/w/file/fetch/145016268/9912285039.pdf
    • http://medodadepud.pbworks.com/f/how_to_create_graph_in_excel_file_password_protected.pdf
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416733/what_are_the_two_main_theories_of_language_acquisition.pdf
    • http://zowonixepor.pbworks.com/f/35152028871.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_off00013980.bin
978cb0c373f6104665577dad32f2b669d83ec0d230513af1e0ed0851a9a0e9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 5284 bytes
font_01_sfnt_off00014b63.bin
58b453d78fd47381c1fb7f70ea86b87b6d5c5dc8479a5ea9a063487711865424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B63 11500 bytes

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