Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b9e04fd941ceaf…

MALICIOUS

PDF

75.2 KB Created: 2021-04-18 19:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d8ce8aa6e0751de3cfbb654be6e101d2 SHA-1: 68ba8566e8c6d8b80e8603fa31223cd87a900f8c SHA-256: b2b9e04fd941ceafa1bf60c6cbabfb39e44ffee2e8d5e2b9ca9719b9fc236476
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=probability+density+function+graph+in+excel PDF link annotation
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/5a446ab697.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/49e84171e48136.pdfIn PDF document text
    • http://lukapar.22web.org/40805844339.pdfIn PDF document text
    • https://xibixijuli.weebly.com/uploads/1/3/5/3/135399677/wixataxabonane-tikezokej.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/16523082929.pdfIn PDF document text
    • https://nofuwotepilob.weebly.com/uploads/1/3/1/6/131636733/ae6c849b91197.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/pengertian_pendidikan_agama_islam_dan_budi_pekerti.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/tawovojo/fremont_ohio_accident_reports.pdfIn PDF document text
    • http://natomilalusirof.rf.gd/lexisalojowifudonis.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/77349288683.pdfIn PDF document text
    • http://bojobepuxotu.rf.gd/attack_on_titan_season_3_part_2_ending_explained.pdfIn PDF document text
    • http://xudazefujigi.rf.gd/repefigebojixotivopox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83cc7c89-e194-42d5-b6bd-8a51e338f77e/nowitawenotem.pdfIn PDF document text
    • http://fitozexazepivol.rf.gd/augusto_monterroso_el_dinosaurio.pdfIn PDF document text
    • http://miwexosekapofaj.rf.gd/hp_2541_printer_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e899d78f-1115-4683-adc8-f9d77f5491a4/what_are_positive_behaviour_strategies.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_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 5728 bytes
SHA-256: 43bd2b9930d7feac719e2eb1645d3020db69ba676360e61231d98a830e489db0
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 11252 bytes
SHA-256: 8383bb03398b154adec7c273e86b7096851a6c9df57d716b8361907935c90922

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