Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d0bee027704a85…

MALICIOUS

PDF

76.2 KB Created: 2021-02-26 09:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef3a014dd8ed2a15a5da0396d6c77476 SHA-1: bbc8556698c15ee346af13719548cc84165c85fb SHA-256: 81d0bee027704a857e878a86d4e9d51981adabf595f410394cfe034d1916b3ad
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirector services, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to game downloads, likely serving as a lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=super+mario+bros+2+nes+game+download In PDF document text
    • https://negipefit.weebly.com/uploads/1/3/6/0/136054485/nozep.pdfIn PDF document text
    • https://josapepukixo.weebly.com/uploads/1/3/1/3/131384602/80472b1e57df50.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/xanedusabew.pdfIn PDF document text
    • http://penageli.getenjoyment.net/epicurus_letter_to_menoeceus_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_601b5c6ca0d4c.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/who_is_veronica_roths_agent.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fdcefc165c6f.pdfIn PDF document text
    • http://emmetrix.net/puzafepinufevigobokudifetd0q5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_5fe2e791375a8.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/e014c374c23.pdfIn PDF document text
    • http://lumacy.site/34791592926e9jnq.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/51419871845.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/1ac9fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468837/normal_5fd08e231d432.pdfIn PDF document text
    • http://rubka.space/66647457580ggfsx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5fe92a003ce68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_60172444da7da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_602cb95006deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_602c6c24e609f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387224/normal_5feefc8fa0d74.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/kevava/nekagatubososigonubosefe.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/16054228350.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/school_id_card_templates_free.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_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5744 bytes
SHA-256: 578848b1feb411c54c786521626c1777f36fa6000439733d3bdb014e69aeb895
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10884 bytes
SHA-256: 9b9519d1d0b29cff1c9123a11b495aa8f1c799060565e51e650f86170d830a8b