Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3fe2fc0d178852…

MALICIOUS

PDF

43.0 KB Created: 2020-11-06 22:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 855b39682bbd2bc32eff3c791e493eba SHA-1: 2d9f4cb73308bc8797edadcb264836acb10c529f SHA-256: 5b3fe2fc0d17885225b40d13e79da95f0af64932e1eb5021f17c337204151f2a
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 4

  • 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://trafficel.ru/aws?keyword=lesion+elite+skin+rainbow+6 PDF link annotation
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/67986b0c6d69dcf.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/38b26bf5443.pdfIn PDF document text
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/gufonugol.pdfIn PDF document text
    • https://mikakegurotitu.weebly.com/uploads/1/3/4/3/134309030/dusoniju_gelixexotup_nezino.pdfIn PDF document text
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/konosibunit_jisovefonokewo.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/dutuzanob/ged_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce94e9a6-3038-4a04-9460-cd6a7b9fafcb/xamifufasogivelasuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4181657-01bc-4510-9f8b-095766f81928/fojatefakatosokarula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cba94d4-37ae-40a4-a70d-d90b097f8572/zavinupedegokefivejakatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48aa4ce-15cd-40f3-bf90-d3cb124c4635/lomozolib.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/aroma_8_cup_rice_cooker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/volewotozanupixovug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f76c8762-efa5-476d-98a1-53ffbc211cad/seloc_marine_repair_manual_1301.pdfIn PDF document text
    • https://debulavoj.files.wordpress.com/2020/11/50879636268.pdfIn PDF document text
    • https://wupomasaxo.files.wordpress.com/2020/11/nifazejimow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2154bf04-9e39-41ca-a987-55284649376d/justin_bartlett_animal_hospital_33411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b137de-f1f7-4d04-98bc-36f6363e5b07/nanivi.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_off00006871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6871 5072 bytes
SHA-256: 10a37ad7d10a089f01a3b59c434e9c61956b5642a6623a99eb2a928d7b84be49
font_01_sfnt_off000079d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D9 11032 bytes
SHA-256: 6f91ffe4cf7d62bcb2b64fe347c71ef27bffcc5f40985024d23118e20abeaadb

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