Malicious PDF — malware analysis report

Static analysis result for SHA-256 775d82c899f510ab…

MALICIOUS

PDF

70.3 KB Created: 2021-03-09 10:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7ff916c67efe5531c53d78fab16d47e8 SHA-1: 32d4901d29c03df7b04d93da3df71c2b5e1bbf68 SHA-256: 775d82c899f510ab8327cdb2fa94f9fb982d0711572d3d3e987baff94431e357
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://kuzutuzo.ru/aws?utm_term=how+to+say+it%2527s+alright+in+spanish', which is likely used to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and link farm suggest a phishing or content-luring attack.

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 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.
  • 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://kuzutuzo.ru/aws?utm_term=how+to+say+it%2527s+alright+in+spanish PDF link annotation
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/lewamenis.pdfIn PDF document text
    • http://baugroup.info/624802543954msa2.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/b3c99.pdfIn PDF document text
    • http://claire-irk.ru/gimamemewotilomajiko1n86j.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/2385387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/adobe_air_3._1_apk.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_12bf7b6b2fdc495b93db16a6bd85e2da.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_e91b9120001a47eea630bcf1dcd7c02f.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_37c2cd90209548259ee39238d53cf2d5.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_5819ca90bda14a31b96c7e78648f1887.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_67f570678bea41d19b5a03e30982db37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/introduction_to_biblical_ethics.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/79922481992.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_2ac61e8e1ed94cf0a9afb993af12fa84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/digital_photo_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/reporter_news_cy.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_d61d912cf1a54682b64b2e0be1b0ef11.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_719e1905af7e4d99b59d5ebbe3eb3ef5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feseni/41369063458.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_e2c4b9722ea04684a28e0498bbb442e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/20681999271.pdfIn 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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 5272 bytes
SHA-256: ad41c5c7e4d251fcfc89efa9e185d3f4024972788d5633f37419754b001a4d82
font_01_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 11896 bytes
SHA-256: cb7fefe3e0f97cd181fac7d6e62396a38f3bac4249917d18b80a40c30212e9f4

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