Malicious PDF — malware analysis report

Static analysis result for SHA-256 2327c46bae3ae2d6…

MALICIOUS

PDF

88.1 KB Created: 2021-03-09 23:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97826343665745f167a5dc12fc5f3a0d SHA-1: 9dfb021c739b841918ee5ead3f909ef0e1c407ce SHA-256: 2327c46bae3ae2d62878c420ade3f5705530d20613b27106bdff6fe397a2e0e0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead users to potentially harmful content, possibly phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=piriformis+muscle+spasm+causes
    • http://ericksandoval.com/kudirigpku.pdf
    • http://fanutoragozogow.sportsontheweb.net/neburareruw.pdf
    • http://cloudplay.xyz/pebesevumuwofovumeberuv1qajx.pdf
    • http://b2b-servis.ru/how_to_use_in_a_sentencekoahp.pdf
    • http://tuvexiwegivuke.iblogger.org/31343030973.pdf
    • http://serdyukov.pro/zoxomfzjnd.pdf
    • http://detozube.scienceontheweb.net/how_do_you_add_fractions_with_whole_numbers_and_different_denominators.pdf
    • http://wajofima.mywebcommunity.org/8445550289.pdf
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/mixesotenusoku.pdf
    • https://jodexozemusokut.weebly.com/uploads/1/3/3/9/133999246/ad99a3cd01.pdf
    • https://dadazifetulo.weebly.com/uploads/1/3/0/9/130969312/wutibexenomejuk.pdf
    • https://fidagavatijib.weebly.com/uploads/1/3/1/3/131398583/5387334.pdf
    • http://xigotazuwal.iblogger.org/lavixasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_b0168c87c33846d59921f233813f6799.pdf?index=true
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_5def23876ff44525a3907b183c435844.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_8e0a3c9f8077410b8998acd07276f744.pdf?index=true
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_6de205b167a540e3866e706dcf9bb12f.pdf?index=true
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_10dbc7d154ee4b6db83dcbe1c59b0f90.pdf?index=true
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_6a59356eb31148a7ae1882253e72f438.pdf?index=true
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_84bfa1c3a17a4d11957f3b687dcf2e1a.pdf?index=true
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_6644ab629c5c4d5ab34e1514e8da8745.pdf?index=true
    • http://luderaguzafa.epizy.com/google_spreadsheet_find_duplicates.pdf
    • http://baxonifegep.rf.gd/nilipebokajenito.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_1d196b92a0014dbc89cfdae4ac0e8194.pdf?index=true
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_2a728176b92f4e5c942fe574e393afb2.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_off000119b7.bin
f0e0e7771a6b9d3cb9fb6ad5ebcca8381be29716c684a105aeb23d74072a753f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 5164 bytes
font_01_sfnt_off00012b30.bin
73cdb3e73b8246fc9f76b9ac8907614b7cbbb59ba46ca5a042442cea8703d848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 12036 bytes

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