Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b72ef7e82e32931…

MALICIOUS

PDF

80.0 KB Created: 2021-04-18 17:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65610728e28699ca55df2b1bf2324dd0 SHA-1: 5bd5ef5957d2c83b237564590ba8cd4ea703c0d4 SHA-256: 6b72ef7e82e329310d71e26b1d8c10a52f06edef63bb309506b5b8b5e96f7c42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO abuse attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious activity, likely involving redirection to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=what+percent+cacao+is+healthy+dark+chocolate
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd63e034e53a.pdf
    • http://tepoparupomo.medianewsonline.com/app_development_software.pdf
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5fc9fb2be9116.pdf
    • https://cdn-cms.f-static.net/uploads/4486981/normal_604ce7d6af60c.pdf
    • https://cdn-cms.f-static.net/uploads/4388174/normal_604aa2544edd9.pdf
    • https://wojopukutipu.weebly.com/uploads/1/3/4/3/134345686/tiduvogakizenekelud.pdf
    • https://cdn-cms.f-static.net/uploads/4420451/normal_602025b237043.pdf
    • https://kesaroxet.weebly.com/uploads/1/3/0/7/130775747/mukevijipedin-fomuwelagadafin.pdf
    • http://xiruzox.mygamesonline.org/61173238047.pdf
    • https://static.s123-cdn-static.com/uploads/4428038/normal_5fc8a33f7c8f9.pdf
    • http://mudixefibewab.mywebcommunity.org/cinderella_solution_free.pdf
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/1937345.pdf
    • https://rolowuwojudazap.weebly.com/uploads/1/3/5/3/135302881/zegezenig.pdf
    • https://vevuwameran.weebly.com/uploads/1/3/0/9/130969214/8555380.pdf
    • https://cdn-cms.f-static.net/uploads/4391920/normal_601330f7cbd2b.pdf
    • https://cdn-cms.f-static.net/uploads/4457272/normal_606a2941a2334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://widifusi.myartsonline.com/matozavab.pdf
    • http://xuxalonitu.onlinewebshop.net/wirigefigesutix.pdf
    • http://vexabimumemig.atwebpages.com/74247037872.pdf
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_3a1605118fe0481c836d40fee67b8682.pdf?index=true
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_3777d69e2171415ab2324c3a52a43325.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_2dcde010c55847c886943f14fec8488f.pdf?index=true
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_62990173c1594e199beec68a9f9f1c1a.pdf?index=true
    • http://ziwivazud.onlinewebshop.net/teas_v_study_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2c.bin
ce2bacf408fa749264e70d7d311734270de594cffe5a14141a1c6155a8301fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 5128 bytes
font_01_sfnt_off0000fc9c.bin
5c096f465189df77022a9c037bffabd28858fb75e29e5542520b55e4f721d1b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10976 bytes
font_02_sfnt_off0001224c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 4324 bytes

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