Malicious PDF — malware analysis report

Static analysis result for SHA-256 645390ef269ad244…

MALICIOUS

PDF

83.9 KB Created: 2021-02-15 00:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ac641783cded7ab23e1c5d1e1bb37d8 SHA-1: c5e998588304e8748666e4a0cb061664ee3eccd1 SHA-256: 645390ef269ad244dd0c9ff6389cc583b9e1f35c27086fc88d715581771380ac
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable domains and Weebly subdomains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=harry+fleur+marriage+contract+fanfic+lemon PDF link annotation
    • https://sugogovofel.weebly.com/uploads/1/3/1/0/131069978/velazame-xurudonovanij-jofix-lewanuxofoji.pdfIn PDF document text
    • https://fefufivakelazi.weebly.com/uploads/1/3/0/7/130739222/9630944.pdfIn PDF document text
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/b6b3f2f653cb19.pdfIn PDF document text
    • https://rejovofutilux.weebly.com/uploads/1/3/1/4/131484728/gupuboxeta.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/432c113b8e.pdfIn PDF document text
    • https://sarisakela.weebly.com/uploads/1/3/5/3/135308925/6660040.pdfIn PDF document text
    • http://kyponnik.online/person_tracker_toolkit_2017_appb0et9.pdfIn PDF document text
    • http://seamanygau.best/tuwudoromekezpcqy4.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/76e29d55d757.pdfIn PDF document text
    • http://ibkreactiva2020.com/international_financial_management_17cq9t.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/nakuzafol/pevorotovatasumojob.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/xbox_captures_to_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/xifukeb.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/structural_adjustment_policies.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/mevojifewoxonufurojuzo.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_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 5088 bytes
SHA-256: ab8ca4d3f8dab118661a1c850e185dc7eecd77da4c6e0640dfc82ea1f11c159a
font_01_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 11100 bytes
SHA-256: fd472ae1284b043678a12a29e57cc5eef0e721faaf412c212a24df21ad47395a

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