Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff1eef30698772e…

MALICIOUS

PDF

77.3 KB Created: 2021-05-02 02:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ff119138dc155ae27eb5e24f620c2ec0 SHA-1: 2e9682a15d5d94688fdb2f3b89905b7190206535 SHA-256: dff1eef30698772e067f06093124f5448b1fba4c73bdfaf77cd7a190dde4cf38
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by a machine learning classifier as malicious. The document body, though heavily obfuscated, appears to be related to the search query "do i need a fire suppression system in my restaurant", suggesting a phishing or scam lure. The presence of numerous links, including disposable hosting domains, indicates a link farm or redirection scheme to a malicious site.

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://zajinet.ru/strik?utm_term=do+i+need+a+fire+suppression+system+in+my+restaurant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499629/normal_606ea40aac5e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392666/normal_5ff31ac45d2cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_5feaff7453cab.pdfIn PDF document text
    • http://fortuneo.biz/8499475822d2rcx.pdfIn PDF document text
    • https://cdn.sqhk.co/salujokep/hfUgdhe/41033378702.pdfIn PDF document text
    • http://okrasote.info/innovative_teaching_methods_in_nursing_education0ybkd.pdfIn PDF document text
    • http://my-favshope.online/wavoloxuxapalit9jo4.pdfIn PDF document text
    • http://karnaval.host/samsung_rf263beaesr_ice_makerx5v7u.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/pool_heater_error_code_e05j9k6p.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/gijsihZ/goddess_kiss_ove_global_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/hf5ibhj/6502823057.pdfIn PDF document text
    • http://lidzadva.xyz/8484338557ohlp7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lisirowi.rf.gd/10708522817.pdfIn PDF document text
    • http://wifudozakiteg.epizy.com/50755471191.pdfIn PDF document text
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_ddb26226a79049f287c59a1f2715c0d7.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_2e2caf60616348d481875fa0f4d64bf0.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_34bddee8bb514cd48c442a9c6d1c11d3.pdf?index=trueIn PDF document text
    • http://vamudijikepefos.rf.gd/8339886939.pdfIn PDF document text
    • http://golokelu.rf.gd/atletico_madrid_vs_arsenal_match_report.pdfIn PDF document text
    • http://palisenedabelo.epizy.com/ccna_training_book.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_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 5256 bytes
SHA-256: 2e2705e2ba0afcacbc21a66a4c54b1d91ad0d4f0550023a4ebaee73afb214d51
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 10496 bytes
SHA-256: f906e7e52eca3f17f813e1ea31697bde7f78a3ea5b1f1b6b736df72956d650c0

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