Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a7c6c4dc819175…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 18:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 69786c77e408384870e84755c8cc7ebf SHA-1: 510ebc52ff02b6bef5c1a3b99f61d013b9108d70 SHA-256: 13a7c6c4dc8191752c34da81ef6c44ec6178fa1de2b0e14b68059a0e47539fe9
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 0.9997

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://ponafet.ru/wix?keyword=profit+and+loss+statement+for+self+employed+free PDF link annotation
    • http://magazinrf.xyz/dabakesomelajabafefovoweowjhq.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/ji7rtij/luvoronejujibafeba.pdfIn PDF document text
    • http://uablog.website/banazabulinomurujugilw39n.pdfIn PDF document text
    • https://cdn.sqhk.co/gujamozulas/idMZiiE/mosuxofukupexuxuzuvobe.pdfIn PDF document text
    • http://superheatbelt.xyz/591366693801tua7.pdfIn PDF document text
    • http://devlp.design/69468651509vpn0u.pdfIn PDF document text
    • http://drenajkrasnodar.ru/job_interview_skills_worksheetxg1yi.pdfIn PDF document text
    • http://bossyonlinex.com/lododajuxuxifilirofowijopshsk.pdfIn PDF document text
    • http://demask.space/61631349153pi4qd.pdfIn PDF document text
    • http://septiki-rf.website/foxapovegumokotakukari4w583.pdfIn PDF document text
    • http://hookup750.website/gapuluwobogezod8pjhz.pdfIn PDF document text
    • http://funseeds.site/how_to_remove_changing_table_from_graco_pack_and_play9yokd.pdfIn PDF document text
    • http://servempieza.site/nunagazametilodupisexxmck.pdfIn PDF document text
    • http://teasmall.space/nios_assignment_answers_in_tamil3v4fz.pdfIn PDF document text
    • http://nakrutkavk.site/burial_vault_forms_for_salep3ohd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_99b6f16764d44475a6dd4d613891a07e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79a43c9-a7bd-43bd-aadc-4e78451fe046/wiselini.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_4d4b3531afef4224a80080e51f9ced7f.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_c6789da488114ae3bee16ee3e89a0b72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa40b48-c2a1-4e27-b081-0fa31e9966c5/nesoxulerono.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_26e3bc3f4d154816b457b72529dc6469.pdf?index=trueIn 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_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 5288 bytes
SHA-256: 6b4ecb9431bf3ebf1185fa60a47f4c395e197a425e7e5b5b65526655740cee96
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 11352 bytes
SHA-256: 0917a24e91e5dbe7f7c7d630541b14e99995af5c34c1c165fe148484a1f0b617

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