Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb433d467f66dda…

MALICIOUS

PDF

78.1 KB Created: 2021-03-16 19:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2a1b72d299671abd331ca9e3177d8b0b SHA-1: 653f0cd1931a75832db23138d0773e9520b45af6 SHA-256: 5bb433d467f66ddadefd78885ecbb4387221d0ea9ac573f1e6f60a19575d9f1c
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It contains numerous embedded URLs, with at least two identified as potentially malicious link farms hosted on disposable domains. The document body is heavily obfuscated, but the presence of multiple external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the embedding of malicious links.

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://seumenha.ru/wix?keyword=el+espiritu+de+lascivia PDF link annotation
    • http://pawezujexas.mywebcommunity.org/5788906162.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/hdjarpa/sijunofejadamul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_60159659bac75.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/idic3ja/62011457823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fc6a56c18f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd664772e80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_603ed6c4a3008.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/makufati.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/12065816808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugukokoner.myartsonline.com/accu-chek_compact_plus_kit.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_14d164e6d6014a5496e3172713920f99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowibatev/is_mortal_instruments_on_hulu.pdfIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_4e387820f5ea4689ab12204fc36ba671.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/assembly_label_jeans_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/simple_registration_form_templates_free.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/78484901230.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/bahria_town_karachi_installment_challan_form.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_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5084 bytes
SHA-256: 209b87f7526ae424eb4173918ebf547efd09c28142328a39e311ca8bcb2f9c09
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 11836 bytes
SHA-256: 42c1234249c61287f84c675287c18ebcd0e5558c0d7e3bffafce8689e155ceac

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