Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dacf143e9b62dc0…

MALICIOUS

PDF

40.9 KB Created: 2020-11-09 10:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 02f0cb82a8422a44b826571c73180d1f SHA-1: 5aa8b48c70f840eaeceebac3485103abbb66957d SHA-256: 5dacf143e9b62dc0554e9ec73086c5f4f9cb3b122302302e72ec39420e3b1f33
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://trafffi.ru/123?keyword=traditional+arts+today.org PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/81978dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f8bf4240fa0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f967d7396fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5f9c60a7b4a09.pdfIn PDF document text
    • https://bokasopuvozanib.weebly.com/uploads/1/3/4/3/134319525/jewipekedulaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f9268740262b.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/somomikew.pdfIn PDF document text
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/xajemape.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/jaxisi.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/fuwawibu/hemp_husbandry.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/nububewepozolesejeguzotuk.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/vatemuposituzonike.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/ariane_6.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/bauder_elementary_school_staff.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_off00005ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC3 5076 bytes
SHA-256: 96eecfc5684222a7f9564f0130f7c59122a7e960db2d48b0c7a61568ee5f10f7
font_01_sfnt_off0000701e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x701E 10880 bytes
SHA-256: 82ac895bb77b49a8bbb61789632c4799e5bff9e0e82a34ab0bd96247c5cb07f5

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