Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3b77db734ad60d…

MALICIOUS

PDF

103.2 KB Created: 2021-06-10 04:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e29847bb028c26e66094feba197c13d7 SHA-1: b70a8dc2296572a19ac4e915d03d79108a230bbe SHA-256: ad3b77db734ad60d06e2d1ffb8f9cb769e61e8c2cdc81b7696be2348336e2914
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/pbw?utm_term=dietas+del+dr+bolio+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385020/normal_6066081a1f658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_602e27f2cb8e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fe9ada09a134.pdfIn PDF document text
    • https://tizomunu.weebly.com/uploads/1/3/6/0/136050200/e9018c9d017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462727/normal_604888bce7fde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5ff3f50643fc2.pdfIn PDF document text
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/fa22048105c7.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/f7035b5e2fcd496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_60bb276e47318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5fcf5d4c4d421.pdfIn PDF document text
    • https://lagizipat.weebly.com/uploads/1/3/2/6/132681030/6580239.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5feb8bc37c0ee.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/4de95269-ecd6-4bb2-9e8c-7f92194a3219/wiwinomured.pdfIn PDF document text
    • http://mabigeroxoso.pbworks.com/w/file/fetch/145006164/zusobetavavajudu.pdfIn PDF document text
    • http://xinunubaz.pbworks.com/f/after_effects_3d_slideshow_template_free_download.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/92300631018.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/como_quitar_las_manchas_de_tinta_de_lapicero_en_la_ropa_blanca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7cbad0-d654-4996-af19-82346463f77c/georgia_drivers_license_change_name.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144668613/biblia_rvr60_palabra_clave_estudio_diccionario_hebreo_y_griego.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/kiribukiwuwabu.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/f/lecturas_cortas_de_comprension_lectora_para_primero_de_secundaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5560d8a-1822-4e35-b158-a5e386beb4a6/38462587819.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144440151/73200047120.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/80040494578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75819a65-7ed2-4380-bbbf-8caf244a1355/why_should_i_go_zero_waste.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_off000156c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C0 5132 bytes
SHA-256: bd3f416a1bdbdb0c4b89493b60cc7ccdca198df25409756afcb24680ca62e4d0
font_01_sfnt_off00016842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16842 12268 bytes
SHA-256: 73374f5842a7221d9f1b735bbb07b049adce1365688e22070c829abf75d5ea59