Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffa577fd193ff2c…

MALICIOUS

PDF

32.8 KB Created: 2020-11-06 23:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 950d16c5bac8aa4bb7c032f0e149ddf0 SHA-1: 923c1278567280d4c80ca861a9d284f2c957a41b SHA-256: 5ffa577fd193ff2c339036e2b34aae1ae17c3293cda4ab2db3085b37e5a67cfc
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://traffnew.ru/123?keyword=tim+tam+tavern+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421614/normal_5f98714414593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f9fd8af76537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wharton_case_book_2019.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/hercules_and_his_gifts.pdfIn PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/formula_auditing_in_excel_2007.pdfIn PDF document text
    • https://xiwifutufumi.files.wordpress.com/2020/11/99988821837.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B8C 4860 bytes
SHA-256: 985b1d18d57f9c1a3992ae00b95712f3ec79e446364d464936c7ec0646227503
font_01_sfnt_off00004be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE5 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00005747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5747 9360 bytes
SHA-256: e311305dcb907ca3528570be32fc73e02ad2420b451b1be1657b8bf4234e9dcf

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