Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef13fee421586ac7…

MALICIOUS

PDF

68.1 KB Created: 2021-02-26 16:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6dca6b99ada287c658a686c581e7a051 SHA-1: ce6e9d8f85f373e2ed1eedf3c489e06e76fb0244 SHA-256: ef13fee421586ac7cfe2b42e5b6293e58aae651daef1f1afb8d19fb0938549fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a primary focus on a URL hosted on zajinet.ru, which is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily garbled, appears to be related to a search query, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=diccionario+panhisp%25C3%25A1nico+de+dudas+real+academia+espa%25C3%25B1ola+pdf PDF link annotation
    • http://xenalebosob.scienceontheweb.net/pobuguwosafenilozikar.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/lakekuteluf.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/XCWLgce/resident_evil_4_ps4.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/nezuref.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/2006_harley_davidson_sportster_1200_custom_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/ngeijhi/galuravexapagagalemonobu.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/Yh4geih/free_streaming_tv_sites.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_600d8cb2555d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_602f1d23ced8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389074/normal_5fc908f354767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_6026e68913c32.pdfIn PDF document text
    • https://cdn.sqhk.co/butexuvokufo/eu9mzKY/7275802063.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/hjdYeAb/voredijuvululakuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5feef3c14bc16.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/miniature_dachshund_puppies_ohio.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/jaxesabi/3506889701.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/bluestacks_free_for_windows_8_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/romikup.pdfIn PDF document text
    • http://pujumek.myartsonline.com/fexosunazerudevil.pdfIn 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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 5840 bytes
SHA-256: ba5dcb322c0198b18d946e0d11643e867968bbec9190d12650ad464ac6fbe508
font_01_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 11344 bytes
SHA-256: f89ed1131842e1f27e9e70e324b3d537a9749de68562fa7ed8357059bb92cb3c

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