Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a60f516affd8282…

MALICIOUS

PDF

79.1 KB Created: 2021-04-26 20:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bc496b4f731fef1f6abe795aa6c57bff SHA-1: 3f1408541e822e34111bd039e240240c8fc89510 SHA-256: 5a60f516affd828213df8e7857cc52a1db0f7b0739969498ceb808c846ba3020
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=black+and+decker+20v+lithium+battery+charger+lowe%2527s PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388158/normal_601f842d7c69b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5fc954b1bfa06.pdfIn PDF document text
    • https://xegafifa.weebly.com/uploads/1/3/0/7/130776616/jilenuk_vusipi_ganidekuzake.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/bandwagoning_for_profit.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/fR8hb2u/5668568149.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/60915.pdfIn PDF document text
    • https://ligizedafovawu.weebly.com/uploads/1/3/2/6/132680967/68395ac1a30.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/heiges0/agile_methodology_swot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_5fe99d089e403.pdfIn PDF document text
    • https://cdn.sqhk.co/daguvemet/gd4fgek/slackline_static_tricks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_6b5591b7f239441b944493c17cb02be3.pdf?index=trueIn PDF document text
    • http://metiguwuwezaza.atwebpages.com/missing_411_download.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_94685d6c6305421e8424b02296f461a0.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_767c313dd5d642dab0e17dad018e5276.pdf?index=trueIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_df8f4155e4bb4559a46605f6e743d2bb.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_9f735af908f546208f757fedb86630cd.pdf?index=trueIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_982731071eb949228574d48b999a25b1.pdf?index=trueIn PDF document text
    • http://wivaxodi.onlinewebshop.net/malicious_code_viruses.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_440f17ae3cc94355a79dbcc6ad481540.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_08fad10526f6448a817c6f47ec20fd5d.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_a1acbfc39c7b468382f90287fd52622c.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_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 6168 bytes
SHA-256: 2ce6268ec11b948c4f45742691c014197a2cd4c929949775ad1cdbea212245f2
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 11152 bytes
SHA-256: 5538b95192fccbd79f6f9016952ce636e24592978a17fe0f2252c12b3256d252