Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72bd9f8aa72aaba…

MALICIOUS

PDF

86.0 KB Created: 2021-03-22 00:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a56a5897cf7255eb8d7e6645b26bdf88 SHA-1: 5d8d9d6dd50b212196bd21ab248fecda30e5b465 SHA-256: c72bd9f8aa72aabae004809c70aebfcd188478bb4f4486af4ffa271f66fc7738
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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/wix?keyword=doom+2+online+unblocked PDF link annotation
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/bufitigifinupabuz.pdfIn PDF document text
    • http://tasiperop.medianewsonline.com/how_to_reset_xr2_remote.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/789459314.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/96f415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5fd665047db63.pdfIn PDF document text
    • https://devuxitimon.weebly.com/uploads/1/3/4/5/134596282/bumopurisi.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/jjBhhih/75047613624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_604986925acd7.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/behaviour_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6045fbd66a30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_601ad65b657be.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/dosaOjj/86867095109.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/vikumapikezaxi_riludarete.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/gikemisusenavogopakaj.pdfIn PDF document text
    • http://noxogejukebe.mypressonline.com/fistula_vesico_rectal.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/bxidbhi/santali_cartoon_comedy_video_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/jgEVigj/kizakidurajutifamitejaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_0d767be9fa45490491b6ee5361107738.pdf?index=trueIn PDF document text
    • http://todiwefexoneb.atwebpages.com/71709578723.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/comptia_cybersecurity_analyst_cysa.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/bugagos.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_05b52dbac3e04a13bf8928ba2aad4ac6.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_f4db4a49197e46f5bda7496d5e7cd24e.pdf?index=trueIn PDF document text
    • http://jubogaju.atwebpages.com/rajisabotefazuzagodanog.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_4e1dae72cda049a78280074da87359cd.pdf?index=trueIn 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_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 4936 bytes
SHA-256: 09650a683e67b3445e18399c72aff1ad8c884814a107bbb0a1c70b5a7fd59702
font_01_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 11656 bytes
SHA-256: 37d1ed1f5e0d849b13218b96cc0d8ff8fbd9cd759ab7ebbf8b3f80abeb22e1f4