Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf7b9f0664df291…

MALICIOUS

PDF

44.8 KB Created: 2020-11-07 13:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a8535a3c949dab6f878e31ea368f8dd2 SHA-1: dbc482e0d3e99cbd023ef44afd5346bd7edc3245 SHA-256: ddf7b9f0664df291e877a82a0ac0b28783e7d843a564304b9e8145bc304d751f
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=path+analysis+or+sem PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xevenupemo.files.wordpress.com/2020/11/towards_a_social_investment_welfare_state.pdfIn PDF document text
    • https://radofet.files.wordpress.com/2020/11/rewunogasarusajuluviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5492e74-6639-4484-a817-18c529f7f76a/passover_haggadah_maxwell_house.pdfIn PDF document text
    • https://vofalop.files.wordpress.com/2020/11/gelitiren_anne_baba_doan_ccelolu_oku.pdfIn PDF document text
    • https://rupuxijod.files.wordpress.com/2020/11/tinenupemekoxajub.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add5994c-c0e5-4993-b13f-e31bf57bb6f6/do_hummingbirds_sleep_upside_down.pdfIn PDF document text
    • https://divitejebos.files.wordpress.com/2020/11/vikonofibi.pdfIn PDF document text
    • https://saxofenofam.files.wordpress.com/2020/11/73320521206.pdfIn PDF document text
    • https://rupaxil.files.wordpress.com/2020/11/vsepr_theory_questions.pdfIn PDF document text
    • https://toxuzan.files.wordpress.com/2020/11/nuvejofisamuwosifiripula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f606eb00-8cd7-4cbe-8489-dc7e663f3ff1/35501419303.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_off00007115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7115 5028 bytes
SHA-256: 18b2745c3e511d3d1f3c95d3475778e05dfb57fdc46a5c85b86e4fdca948553e
font_01_sfnt_off00008206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8206 10568 bytes
SHA-256: 703309e95e88c36f87bdd85bdeb320d9d51f6c62eb34b3ab554465cfc878e29e

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