Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b5bee34ec071e6…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 15:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3b83634f29b5b4c361e03f23bd0225a2 SHA-1: d6c8034b9673b62d86146c51744e4d0683808fa7 SHA-256: a5b5bee34ec071e6389cd70ca271ce20c5405529be36f1f2b993f3a9c388d51e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to distribute malicious files. The presence of numerous unknown reputation URLs further supports this, indicating a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/award?keyword=basic+electrical+electronics+engineering+book+pdf PDF link annotation
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/4650370.pdfIn PDF document text
    • http://artyom.guru/231872496732kv84.pdfIn PDF document text
    • http://xuwivezotuw.22web.org/molaleme.pdfIn PDF document text
    • http://demigatakubap.iblogger.org/daemon_irrepit_callidus_sheet_music.pdfIn PDF document text
    • http://titibes.iblogger.org/89589535921.pdfIn PDF document text
    • http://satofaxa.iblogger.org/akele_tanha_jiya.pdfIn PDF document text
    • http://idem-peshkom.ru/sovesujoladuzkp80.pdfIn PDF document text
    • http://yewes.space/1814643454a1weq.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/wupizezifalubokip.pdfIn PDF document text
    • https://fekunifiso.weebly.com/uploads/1/3/4/2/134266639/wupobawigul-fujibu-weluzizol.pdfIn PDF document text
    • http://igme.site/arealme_english_test_answersv2fgu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/davv_cet_registration_form_2018.pdfIn PDF document text
    • http://dodudulu.epizy.com/icloud_photos_windows.pdfIn PDF document text
    • http://sexikiti.epizy.com/who_makes_rheem_furnaces.pdfIn PDF document text
    • http://kexobub.rf.gd/17731953859.pdfIn PDF document text
    • http://wabalegawamiraj.rf.gd/57363920828.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/airtable_conditional_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/vanaspati_information_in_english.pdfIn PDF document text
    • http://dobejul.epizy.com/34420872669.pdfIn PDF document text
    • http://manepuw.rf.gd/57415481331.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/disikizonuxunebavetagis.pdfIn PDF document text
    • http://rifimazagajide.epizy.com/guided_reading_activity_4-_2_american_history.pdfIn PDF document text
    • http://vegewamofuxa.rf.gd/play_chip_s_challenge_on_android.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 5576 bytes
SHA-256: b3b775ffab8fb979f4c54e2809402875c4823a76c98af2ffa5bbbc9e747ac637
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10868 bytes
SHA-256: d49a8eff99da7cf9f815e9a7451f508905e06f4f57cb430ceb7555d56218569b

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