Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd95122f936ccc63…

MALICIOUS

PDF

83.3 KB Created: 2021-03-05 04:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3a61c4b7606c0d475e414825a131ae77 SHA-1: bb1c968b91ec0c38b51d2f0b643a624230c4cdce SHA-256: fd95122f936ccc63b40f89090a6edabde6f7758f2dac156ebe5325a0b48da342
196 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to SEO-optimized URLs, suggesting a link farm or phishing campaign. The primary malicious URL identified is 'https://resalured.ru/123?utm_term=a+supposedly+fun+thing+i%2527ll+never+do+again+review', which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/123?utm_term=a+supposedly+fun+thing+i%2527ll+never+do+again+review PDF link annotation
    • http://lienforkid.com/dovatugixupinekukularap1z5rl.pdfIn PDF document text
    • http://tesekitogibop.22web.org/interactive_project_management_dashboard.pdfIn PDF document text
    • http://nigma24invest.online/49366236998kw3k1.pdfIn PDF document text
    • http://kemytbok.xyz/zizut6mj8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_bfa5533ee39d40b18ad86a0976083f4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/35947995669.pdfIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_5a1d384924cb4ab8857f91583d703e46.pdf?index=trueIn PDF document text
    • http://zugoxovok.epizy.com/35198419536.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_ac96e9d9c672486385c486a4dd34850d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/70905530179.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_3d39e6f4132f49c9a3300d65df591e43.pdf?index=trueIn PDF document text
    • http://divogidiguxofib.epizy.com/employee_training_and_development_articles.pdfIn PDF document text
    • http://kobewanen.rf.gd/jusimonukibimamiwoniva.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_f54a808f8ff34e7b846a00ad23e53723.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovugi/witiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/pradhan_mantri_awas_yojana_form_gujarati.pdfIn PDF document text
    • http://panadokopejed.epizy.com/53399140412.pdfIn PDF document text
    • https://f48bd47a-883b-4fd5-b48c-91096c2de617.filesusr.com/ugd/455f95_b12f37a794bf471391321a9ccd63d2fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/do_tribes_pay_taxes.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/microwave_recipes_indian_vegetarian_snacks.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_a5e56d76a9054391af1bdf05e39d5de9.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_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 5580 bytes
SHA-256: 827206834f38dc11a301630bdae5435de42b3f9d18505130f8ba7a228bac4c59
font_01_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 10656 bytes
SHA-256: 7738f842b4987270d1e403a816d6a27f26ecbb5a6e0497436396ad86d0bddd0e

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