Malicious PDF — malware analysis report

Static analysis result for SHA-256 4838cb16d8fd6cd6…

MALICIOUS

PDF

79.4 KB Created: 2021-05-02 07:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9553ac748d38a8e9718bb071209eedf SHA-1: 843677eaf04df39fc8187c7a4950b39b72155ed3 SHA-256: 4838cb16d8fd6cd65c84de316dcaef05f3cd08ac30670c611d4b3dc62fc5e35c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://resalured.ru/strik?utm_term=functional+training+workouts+pdf PDF link annotation
    • http://purpless.vip/what_is_the_average_cost_to_install_a_electric_tankless_water_heaterqfts5.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/18530f5ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5fe4255ae5c4d.pdfIn PDF document text
    • http://alsamcctv.com/teworomafeka8f19s.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/hdhjN6k/car_simulator_pc_game_online.pdfIn PDF document text
    • http://zafuwozemupojaw.22web.org/witad.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/PRNigje/virtual_puppy_simulator_pet_dog_family_adventures.pdfIn PDF document text
    • http://kanshoper.site/321871911463alqa.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/hdl8jhW/blazetv_sign_in.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/gy3jejg/puwuvasovimubored.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fdf49d059490.pdfIn PDF document text
    • https://tezimapegimera.weebly.com/uploads/1/3/0/9/130968984/ea77887ab526a.pdfIn PDF document text
    • http://xegevapu.iblogger.org/74039833174.pdfIn PDF document text
    • https://mibamubotasuzat.weebly.com/uploads/1/3/1/3/131381640/pibivadibozatelilol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601b34b271fe8.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/wvnjiii/crashing_uk_season_1_cast.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/busijesuzot-rabarawiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464710/normal_5ffb379a91d27.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/wujapovifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zalomi/napujudomomewevu.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/ingredientes_para_hacer_nieve_de_garrafa_sabor_limon.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/how_to_find_registered_owner_of_vehicle_in_california.pdfIn PDF document text
    • http://zosunofurokor.rf.gd/blend_for_visual_studio.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_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 5432 bytes
SHA-256: 017714d2613e58522c783dc2cc138ad9ccc6d74585c97b6fb528b23406dcf0e2
font_01_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10352 bytes
SHA-256: 142c4db4dce6ed18a7ef9b3140a4cd3181177c94bf0fe8589420cf75b0d5b901

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