Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b4ce3be9977b8e…

MALICIOUS

PDF

59.8 KB Created: 2020-11-06 14:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da11708231e9b00e9e4ff5c1f23a611b SHA-1: 2bf67d6ac227cf18a6de3aa8cdf7384ea4c743be SHA-256: 35b4ce3be9977b8ee005774f01d4df8af45678266a8aa6cda64cb47cc182de78
96 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 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://traffking.ru/123?keyword=boston+to+worcester+mbta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fa5282560363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f99d0067cc0c.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/9e092558626df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_5fa15a49ef2e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5f9a044302162.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/rawar_xosuwobinam_rixanewixereji_tesimaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_5fa1025f15a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5f98a7c2a1752.pdfIn PDF document text
    • https://senapuvuv.weebly.com/uploads/1/3/4/4/134459053/185883ea5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0831/7348/files/wisobibebor.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/consumer_cellular_apn_settings_att.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8445/5330/files/2962672457.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/clifton_davis_actor_biography.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A93 5192 bytes
SHA-256: d226d33e34ae69341425bbd663f5c8acd22fa5ed1c43d26882dc2167613045fa
font_01_sfnt_off00009c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3B 14960 bytes
SHA-256: b409e0da9d92d0c619484a59d86e546274de55221dddaa083f036a09c0180050
font_02_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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