Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ae80ea815e342a…

MALICIOUS

PDF

91.6 KB Created: 2021-04-05 03:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b6d9e9448754065e3d41dcdd2c560a76 SHA-1: 923ed6348acb388c3edbfa61188da845c1efc53b SHA-256: 18ae80ea815e342a82ded113a8fec76d5654a316fb742c436ebca6d392442757
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://nipisod.ru/strik?utm_term=software+house+ccure+9000+certification PDF link annotation
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/a7eca9f1d0.pdfIn PDF document text
    • http://tugofexofuwaza.22web.org/50611476535.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/a329d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fcd1753bf77f.pdfIn PDF document text
    • http://gramnews.xyz/kagagilijujitekevima7ezyn.pdfIn PDF document text
    • http://soxisit.22web.org/93630764443.pdfIn PDF document text
    • https://nulosumewure.weebly.com/uploads/1/3/4/6/134645663/jaxidep.pdfIn PDF document text
    • https://nemapawa.weebly.com/uploads/1/3/0/9/130969411/rovolifizotix_bikoleda_baroxapere.pdfIn PDF document text
    • http://teenagetutor.online/gaxeniwekotudejasokevimi8qc9g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_6020fbf5a3149.pdfIn PDF document text
    • http://electriccannoz.club/the_book_thief_movie_critical_review8vf75.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/7778567.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/rilexazejuzovep/where_is_the_closest_post_office_box_to_me.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/xugazow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37734e34-3942-455f-a864-54e44fce1ca7/understanding_mass_haul_diagrams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e4eb64-3aa4-44a5-9e3d-d069281edf18/jugarivaviruxosefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954e8b09-2a26-47ba-8018-b7b1285b2e20/99029184643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c2c6d5-2d87-4f43-a060-b812cde17dfb/71787464055.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/the_waverly_school_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/sesevunebunisitodu.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/30690786737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64795227-0a54-4b3b-97e8-328c931f5f13/nimorafidofugigixotativ.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_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 5428 bytes
SHA-256: 3e8f06faaf7c858983a5a14e75537d5c7b9cac610bc069f51a2c3fb3df7662e1
font_01_sfnt_off0001392b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392B 11156 bytes
SHA-256: b45501d67162e71815adfc1beb5f444886317dcc047a4f814055ee7aad3c0396