Malicious PDF — malware analysis report

Static analysis result for SHA-256 099b5f3e3b539f57…

MALICIOUS

PDF

73.5 KB Created: 2021-05-07 15:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c4261248735b167f47a43a4411785cd SHA-1: 1dd5487b5df8387b1a1f3054e4f157c780df5318 SHA-256: 099b5f3e3b539f57a23dc66813150f768609d1d5bfba6ed9e34c86abd7cf8769
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+reset+2012+jeep+grand+cherokee+oil+light
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/9588701.pdf
    • http://raisinshub.club/percy_jackson_and_the_lightning_thief_netflix_australia5rjmi.pdf
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/02619c2e9a321.pdf
    • http://lopitimew.mygamesonline.org/alphabet_bingo_cards.pdf
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/de1d2b723d1b56.pdf
    • https://cdn-cms.f-static.net/uploads/4460677/normal_602deff41dc93.pdf
    • http://neriwor.medianewsonline.com/how_to_edit_file_for_free_on_mac.pdf
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/e515cae6a29ffc.pdf
    • http://rovolimobu.iblogger.org/agricola_rules.pdf
    • https://static.s123-cdn-static.com/uploads/4481839/normal_600503812acc8.pdf
    • http://allerlo.xyz/potassium_phosphate_dibasic_safety_data_sheetjfllb.pdf
    • http://xikapajami.mypressonline.com/monroe_shocks_catalogue_south_africa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nowokil/tidisozanenojevo.pdf
    • http://tigisatobenuwi.epizy.com/95878773931.pdf
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdf
    • https://s3.amazonaws.com/guxosa/proc_report_descending_order.pdf
    • http://satanomoxa.rf.gd/81142587331.pdf
    • http://kabuzore.atwebpages.com/kokeza.pdf
    • https://s3.amazonaws.com/xokebore/hunter_dps_classic_wow_bis.pdf
    • http://mepumubim.rf.gd/53942135825.pdf
    • http://vimobuzu.epizy.com/b350_bazooka_manual.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_off0000e1cb.bin
4844ae76af1954c70ff110f5690a4ca1e230aa49558c83379fc73cd8f24ec852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 5852 bytes
font_01_sfnt_off0000f5cc.bin
60895dc0c17060ac5b6631f6f6d4344c88c1e28f90224f68a77082e512903b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10120 bytes

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