Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae653cdfc2dd6db8…

MALICIOUS

PDF

79.1 KB Created: 2021-06-14 08:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 736d10f32f5b61eb3e342b02b25cbd4c SHA-1: 8001b83e65a49321979d3bec9f0bed9f02ca6294 SHA-256: ae653cdfc2dd6db8793f671d241cfbf291b69acb70a2d0e2d08fc2e78e9b07a5
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing attempt. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://laborke.ru/pbw?utm_term=ghd+sports+tv+for+pc
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5fdea92681525.pdf
    • https://wejilosadala.weebly.com/uploads/1/3/0/8/130815097/7656890.pdf
    • https://sawilemevopano.weebly.com/uploads/1/3/4/5/134577559/xibonedu.pdf
    • https://cdn-cms.f-static.net/uploads/4464732/normal_6049d337b7764.pdf
    • https://cdn-cms.f-static.net/uploads/4393485/normal_6012c978539b4.pdf
    • https://cdn-cms.f-static.net/uploads/4377928/normal_60bd6100682c3.pdf
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5ffb6c1863936.pdf
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5fdb3a95cb18f.pdf
    • https://static.s123-cdn-static-d.com/uploads/4461751/normal_60b52298e743c.pdf
    • https://purusexubike.weebly.com/uploads/1/3/4/0/134000510/3380110.pdf
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5fe1ec0594f2c.pdf
    • https://static.s123-cdn-static-d.com/uploads/4411917/normal_60b0989507c2f.pdf
    • https://cdn-cms.f-static.net/uploads/4427300/normal_601a01dec1bdb.pdf
    • https://static.s123-cdn-static.com/uploads/4489257/normal_6002056741efb.pdf
    • https://mimibixerogogo.weebly.com/uploads/1/3/4/7/134742821/8815597.pdf
    • https://cdn-cms.f-static.net/uploads/4416318/normal_60c05a53bb642.pdf
    • https://static.s123-cdn-static.com/uploads/4377678/normal_5feef284f0011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c2e14efe-6ea9-4f41-aa0f-ac237bb70dd4/tagotadesofetelomi.pdf
    • https://uploads.strikinglycdn.com/files/7abb6040-3173-43bd-86b2-1451961b7cff/power_pressure_cooker_xl_cooking_frozen_chicken.pdf
    • http://mazibudikor.pbworks.com/w/file/fetch/144674412/abraham_heschel_god_in_search_of_man.pdf
    • http://paderukut.pbworks.com/w/file/fetch/144745479/best_free_hashtag_generator_app.pdf
    • https://uploads.strikinglycdn.com/files/3787b466-deb8-4548-8697-f44e87532cdb/vuxujigow.pdf
    • http://latijanitus.pbworks.com/w/file/fetch/145281384/lunozu.pdf
    • http://sizolasipape.pbworks.com/f/the_binding_of_isaac_rebirth_free_download.pdf
    • https://uploads.strikinglycdn.com/files/15e698b0-3949-4c73-a56d-5663ac279e6e/png_text_maker_app.pdf
    • http://goxeguj.pbworks.com/f/dante_la_divina_commedia.pdf
    • https://uploads.strikinglycdn.com/files/273c1f97-b9ce-40cf-a051-ed2d7f4d037f/n1996_motherboard_diagram.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_off0000ef72.bin
4bf0e005f3172714ef9dfb2435581931d7aa51e2034022d9c7cb5d89ed5e0380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5092 bytes
font_01_sfnt_off000100d3.bin
52f7e2e60bad03c832325ba793f61edaa0405da3fe9f9e2c43790a2d2bae8e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 17440 bytes

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