Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c8321864d94a73…

MALICIOUS

PDF

41.4 KB Created: 2020-11-08 05:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 70012ad65ab9eb4765b6add9b1c3cf11 SHA-1: 3671ee4d5ee6088480717a801963103a5fa87ee3 SHA-256: d4c8321864d94a738108ba1d412eea57daeef894b9c580129bb81904d5548f49
166 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafftec.ru/aws?keyword=ancient+greek+democracy+kids PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5f9fa259814fa.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4384634/normal_5f91f252a5336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_5f928f1165ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f9c6aa641f32.pdfIn PDF document text
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/069ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5f8bea6c1246e.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/a9bba0cfa7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dusurujadexo.files.wordpress.com/2020/11/sgt_john_curley_live_pd.pdfIn PDF document text
    • https://gobomob.files.wordpress.com/2020/11/vuvebijazigal.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/niwidevajewefanugefujisev.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/5bbfe344-cfe4-4a71-aea3-a5283a9f6dfa/xixosemojafirizutazovisaf.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/77650176497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ab1715-43e2-4079-a30a-7629b3f2dac2/maxanukiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/josasuvamosat.pdfIn PDF document text
    • https://pixetimel.files.wordpress.com/2020/11/91115823019.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://s3.amazonaws.com/remoxi/rixebol.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.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
    • https://gobomob.files.wordpress.com/2020/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FC 5380 bytes
SHA-256: 44191293ff190f1b24bb6703b2f984ce0b7789a6ebb7d90f80528c9f2c346131
font_01_sfnt_off0000753d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753D 10360 bytes
SHA-256: 999096525f09f96dc2794dc7c848b97af36620cb76312f77ea39c3f5044e4702