Malicious PDF — malware analysis report

Static analysis result for SHA-256 71979ccc78604da5…

MALICIOUS

PDF

46.7 KB Created: 2020-11-07 05:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c7b43f65be68d331ec5882ed6e52ced2 SHA-1: 2f11189918d80cb5913a4ccd12c817b9eca19ca6 SHA-256: 71979ccc78604da51bfa8e4c5c2ceff59fa3ea1ddb6589399eebfcdcf3053de1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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://trafftec.ru/123?keyword=equations+with+rational+numbers+worksheet+pdf PDF link annotation
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/8640575.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/momimowofotek.pdfIn PDF document text
    • https://mupaxezofede.weebly.com/uploads/1/3/4/3/134317166/ruzalo-sexejeka-jolaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5f959027ca5f8.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/52afa65.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/xawinaf.pdfIn PDF document text
    • https://pigasuranebuja.weebly.com/uploads/1/3/4/4/134459694/lefegiriliradofikel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f88bc83ba5d6.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/moripudolaveso_jatabow_sozevarave_puzuxini.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://daxazepuj.files.wordpress.com/2020/11/70991830614.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://xeruluzolu.files.wordpress.com/2020/11/gunanegezitujugalevodero.pdfIn PDF document text
    • https://dinozab.files.wordpress.com/2020/11/cambridge_igcse_periodic_table.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663A 5544 bytes
SHA-256: 6cec535de0a8c9e70437310bdbdbfc6303d6f7851848bb9edc7fda084bb92c12
font_01_sfnt_off000078f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F2 11296 bytes
SHA-256: 7b9935f20786ae3f2d205f37162a93e26e41a506e2ce55211212bd157bd4c406
font_02_sfnt_off00009f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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