Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e8619eaee28861…

MALICIOUS

PDF

73.7 KB Created: 2021-03-06 13:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f516147034955593add80ea188d9a781 SHA-1: 790ebeb57791ccd7478dfe2b34e6a79fc645acba SHA-256: b2e8619eaee288614170ac34c26585134cdf84a4fb9c7b2a3e8e6802b30b3350
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious websites. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=modo+de+produccion+primitivo+esclavista
    • http://verifybadgehelp.com/organic_chemistry_2_reactions_summarydvdhn.pdf
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/7104852.pdf
    • http://uanews.website/xinabosawddzc1.pdf
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/0aaa369e6a2cdd.pdf
    • http://laxana.ru/the_innovators_dilemma_ebookk4f1j.pdf
    • https://jeletizasi.weebly.com/uploads/1/3/4/6/134640559/xizexo.pdf
    • https://rufufuwoka.weebly.com/uploads/1/3/1/4/131454634/5957361.pdf
    • https://cdn-cms.f-static.net/uploads/4426270/normal_603b5bde318f8.pdf
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/kagawekibutifari.pdf
    • http://callup.today/10462230132nwt3k.pdf
    • http://winoorama.site/uk_mens_coat_size_guide45pj4.pdf
    • https://cdn-cms.f-static.net/uploads/4451205/normal_602ec2a9875f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_5a804be4f43345238936445d6cecc114.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_72a0f469a0244d87a95fa85ec034fe50.pdf?index=true
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_c273be8129c0471cb97530e28441e267.pdf?index=true
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_17b6d1dbfc834efd9dc06620fe5111fd.pdf?index=true
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_42d0e3ae950941e8be1c2f095e4392d9.pdf?index=true
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_02eae74cfe124e5caa3ec000f65a1bae.pdf?index=true
    • 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_off0000e0a0.bin
054cc8601a6614a7b945825e48d51f3c9f31a52a09f72946db4a88fbdffc9822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 5284 bytes
font_01_sfnt_off0000f291.bin
6c9ca493b67b06cdbe635b5888bd1d6dc326e44e690ac16ab1b13f73c7afb704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 11536 bytes

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