Malicious PDF — malware analysis report

Static analysis result for SHA-256 036c4cb40b40ce92…

MALICIOUS

PDF

83.0 KB Created: 2021-04-13 17:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38033636b1ada327fd2911f573dcedc9 SHA-1: e2ce426ae1616634524f882c4b416d274ca68b7d SHA-256: 036c4cb40b40ce92ad33ad4474f3819cad88f95f0dfb7585ee63537db5fd082d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The primary malicious URL identified is https://botokaw.ru/strik, which is likely used for phishing or to serve a secondary payload. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=starbucks+k+cups+iced+coffee
    • http://vowujebotoza.mywebcommunity.org/77327983568.pdf
    • http://foramodosug.mygamesonline.org/jinakolu.pdf
    • http://boforotaje.mywebcommunity.org/designing_brand_identity_free.pdf
    • http://idealica-tufficiale.website/1591022223gb8l3.pdf
    • http://joy-todays.online/62834849342hfy4y.pdf
    • http://xepuxesadara.mypressonline.com/rufumuxosuzumeda.pdf
    • http://bosemefawixuwov.mypressonline.com/5662289668.pdf
    • http://pezuzumosuxuku.22web.org/kokizunawubebotabadelepak.pdf
    • http://huaweistoreukr.xyz/pretty_little_liars_tv_series_age_ratingtpfab.pdf
    • http://oneitshop.info/adding_and_subtracting_fractions_with_different_denominators_examples5taom.pdf
    • http://dowotezovemalo.mygamesonline.org/lotiso.pdf
    • http://dusanaputojinon.mygamesonline.org/fivukoxolidutujanarabek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jigezilor/battletech_alpha_strike.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_672eeba76b63459bba2c9f5c49c21706.pdf?index=true
    • https://s3.amazonaws.com/bulujono/zetuvenidusomu.pdf
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_829562a1f6c64937802343fb03d26276.pdf?index=true
    • http://ruzupaxenerod.epizy.com/96233586222.pdf
    • https://s3.amazonaws.com/donarepemi/typography_design_free.pdf
    • http://tudugir.atwebpages.com/61296276519.pdf
    • http://kubomefewofumim.atwebpages.com/gokugadosibanuxug.pdf
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_ef05e9d44ded44fabf8ef44c1180a119.pdf?index=true
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_048e962157f74bc48b4fe32e0b74f020.pdf?index=true
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_ddf4dbfc865a4e35aa67dfca1ea900ee.pdf?index=true
    • http://laverowe.epizy.com/comparison_of_adjectives_and_adverbs_worksheet.pdf
    • https://s3.amazonaws.com/dagasopones/down_at_the_cross_hymn_chords.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_off00010338.bin
794d639ff12f643b72897777a5b821583a8bd4299ea0987afb6b1229e1560bf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 5424 bytes
font_01_sfnt_off000115b7.bin
95178574c7d41d1e09a9e25310e5535741abd45ae110dc487bc2b887676b77e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 11636 bytes

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