Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1eb743a5cf8d74…

MALICIOUS

PDF

80.7 KB Created: 2021-03-11 06:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 694ce481406311a3dc29750043bcaf08 SHA-1: 1b2cce702063f587b3f836fe0d6b41fa3eca5d2d SHA-256: ce1eb743a5cf8d74a93c78d2f357bccb1f024e77d5dfb4da568d2bc043568799
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • 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://pelibifir.ru/wix?keyword=elements+of+fiction+review+worksheet PDF link annotation
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/jirexolitajo_kazupukepelo_wijegagu.pdfIn PDF document text
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/mewizej.pdfIn PDF document text
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/xumubekamitodapuw.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/9f195003ec68.pdfIn PDF document text
    • https://dolopexoje.weebly.com/uploads/1/3/1/8/131872138/lekowawe.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/ijjige7/the_weather_channel_app_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/hbbjjgM/16893409546.pdfIn PDF document text
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/3170101.pdfIn PDF document text
    • https://lojumokixawivi.weebly.com/uploads/1/3/4/3/134370302/7565844.pdfIn PDF document text
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/lefuguxuwen.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/fdYYcPF/givupowuzin.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/jekh8hj/crunchyroll_naruto_shippuden_166.pdfIn PDF document text
    • https://gebovobavafol.weebly.com/uploads/1/3/1/4/131406715/xasojiz.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/gebuf_dudixug.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/hiiih4Z/731286099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/206adea0-106f-4b7d-b341-dba3a18943dd/que_es_la_educacion_basica_media_y_superior.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8f010a-cf67-4041-8e2b-e3bab26edbf7/bizudun.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_68c6934ab50c4eeda1fb1661adaf1758.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_5de60c66020942ca8d10e2abd3ee2a08.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_6293ae51517b41f698166e497591815b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e694deb6-9bc7-4df1-89f0-a56b09e55a33/my_friend_dahmer_castellano_descargar.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_b5854c8a755e4bd0bea3eeae3f1fa2a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/889929af-8989-47dc-b3f5-b5c09991f936/ejercicios_de_limites_resueltos_universidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5de37e3-6e49-469c-8dc7-aaa157c71b19/delunimod.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_38df45b488ed4bec9d1318a82285246b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b321d1-975a-4e4e-904f-c67bbf1705ba/zeluxisinijup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55105c31-c673-449a-8ed9-74735623a64b/vavakosek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4f6f4a-0e1b-4ab1-860e-16dbb87a3744/hard_lateral_thinking_questions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 5084 bytes
SHA-256: f86b1fad3d0fb8ec4748ff5b45c8e9f395a4a5ce33e656270648f9b3985a2b37
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 10440 bytes
SHA-256: 1303fa4e67bc981687cd7ec70660fadcc2d1dddac1342c36bafc42a1db2db3f6