Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b11f59bb37098d…

MALICIOUS

PDF

75.1 KB Created: 2021-04-22 05:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c77a318ab2836411e460b27c3e1ed5c8 SHA-1: 75cccdf361a2a6ff5b8c0d8e1f3dfcc2bb698c97 SHA-256: 40b11f59bb37098daf2be2ff50f9feebd77ce92341b5a990822110019b1e0544
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary lure appears to be a search query for "What is huygens wave theory of light", directing to a URL on ponafet.ru. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://ponafet.ru/strik?utm_term=what+is+huygens+wave+theory+of+light PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fcd1f1d48473.pdfIn PDF document text
    • http://gutprod.xyz/xebemanasuvalufmia54.pdfIn PDF document text
    • http://reabook.online/numibigi85wu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fc95cee68c54.pdfIn PDF document text
    • http://fakts.design/mastercraft_courser_cxt_285_75r16pl7n4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5ff0317a2eca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_60432cd80a28e.pdfIn PDF document text
    • http://megarafulosibef.22web.org/naretogovedas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_05394355fd9d4df98a659aa82f0ea7fe.pdf?index=trueIn PDF document text
    • http://pupovedifa.rf.gd/keto_diet_plans_free.pdfIn PDF document text
    • http://faminosokaru.epizy.com/62741802405.pdfIn PDF document text
    • http://rajuxibusajebob.rf.gd/seth_thomas_clock_repair_parts.pdfIn PDF document text
    • http://dukedofabi.epizy.com/reportar_tarjeta_credomatic_costa_rica.pdfIn PDF document text
    • http://gajuxobap.rf.gd/remote_desktop_support_interview_questions_and_answers.pdfIn PDF document text
    • http://gujimimokogofe.rf.gd/emotions_definition_psychology.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_8b5fb492cf774287bbbdd3a7b7483ab7.pdf?index=trueIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_2caa73d6c2464ad2987d42cbac53a2e9.pdf?index=trueIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_c23bf80299194f1098aba2c1a1821720.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_89fb251201e04c66be3d2cda327cb33e.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_169fc325cd3f46c1b9d2bea084f02849.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_cb57e1d0e87f471f99fc5f779e2f7613.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 5176 bytes
SHA-256: 7b7d6e47cd560f46c7c722e370bc7c438ce016ba0abaaf500d745e675efe8d11
font_01_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 10080 bytes
SHA-256: 138344bd1bda32ac328a0dcdfd7317a7f19000dbe0b6c16510ca255f54052e23
font_02_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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