Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bff16af03c2b291…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 13:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7b84ec35095cd3ab7c35f312c64c42a2 SHA-1: cafe25cff68aa5af5fcc14a8d9a381c4b860c9bb SHA-256: 1bff16af03c2b2910e3efd8f7760298cb61694105bb87c274c386865fefda244
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/aws?utm_term=free+printable+weather+worksheets+for+1st+grade PDF link annotation
    • http://ca-management.website/crs_reporting_cyprusktrtl.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/TGjbmji/tolujawimubi.pdfIn PDF document text
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/panigofajox.pdfIn PDF document text
    • http://ourfanz.com/delicious_dinner_recipes_vegetarianpncy0.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/eBhagiW/xogonevotelanuxiw.pdfIn PDF document text
    • http://uablog.site/lowatemekidimajuzoruvuyeufx.pdfIn PDF document text
    • http://vash-fasad.live/siegefall_apk_modf83kw.pdfIn PDF document text
    • http://i12tws.website/72835254690m35mp.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/dggSsNe/44442720731.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/ejdVsgj/zepeto_game_apa.pdfIn PDF document text
    • http://edalovert.xyz/pneumatic_drilling_machine_working_principler0opm.pdfIn PDF document text
    • http://by-roof.ru/895258786654c649.pdfIn PDF document text
    • http://vinorama.fun/48766094505u686.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/kobivimelelo/yesu_we_ambassadors_of_christ_choir.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/comala_workflows_user_guide.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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 5604 bytes
SHA-256: 0b2071bf767da1d23c8e9d4da36fa775b3166817685ce486aee0a642adde51b3
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10944 bytes
SHA-256: 771ed4dbeeb0e65ddbb09ff78dad0d7b163f1a0d842a94b9df38ca3d4938d8bd