Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1e79b5765f95f2…

MALICIOUS

PDF

89.5 KB Created: 2021-03-27 22:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30ec05854dacf32638285fb49a26315e SHA-1: b4ddc30ad773882ad97777f86bd9575392f00d87 SHA-256: 1f1e79b5765f95f201b03b0a38eb0f87d3844ca5bb16c63e905350730fb04517
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. 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 0.9996

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://gimoguvi.ru/award?keyword=tb+meningitis+treatment+guidelines+pdf PDF link annotation
    • https://cdn.sqhk.co/jotepomi/ivUkihV/kepuji.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/adding_and_subtracting_integers_fun_worksheet.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/xowobinu.pdfIn PDF document text
    • http://rapiwanijisage.scienceontheweb.net/89744003167.pdfIn PDF document text
    • http://epipog.com/how_to_get_emergency_power_of_attorney_in_ohio8sw3h.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/jinibupavawovumoguraie1ge.pdfIn PDF document text
    • http://vitetiw.getenjoyment.net/88748892257.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/jOVhbje/313383685.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/wjaLljc/vabexekowuxasav.pdfIn PDF document text
    • http://airned.ru/rejoviser8pawh.pdfIn PDF document text
    • http://futigovu.scienceontheweb.net/pdf_bible_kjv_free.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/purefovepinejesaxatidi.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/iigdqUg/loxilabatupavuxopaxejarum.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/98189513501.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/oxford_dictionary_file_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/6hcifSr/kikamugat.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/malav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zaposupi.epizy.com/75067345570.pdfIn PDF document text
    • http://wilafavibu.rf.gd/32857095881.pdfIn PDF document text
    • http://xajezenu.epizy.com/catalogo_filtros_tecfil.pdfIn PDF document text
    • http://dadagax.epizy.com/bon_de_livraison_dfinition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 5224 bytes
SHA-256: c33f74f649556ef8e15348c240410aaff9d54733562b16afdecb3484499e23c2
font_01_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 12700 bytes
SHA-256: a5d36ae9147a087ea49cc8bec8dcf4d467182e9649894874961393b47e124706
font_02_sfnt_off00014a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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