Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5419a81a126bda1…

MALICIOUS

PDF

73.3 KB Created: 2021-02-22 22:35:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ef643a2ec32acb6c17b0f3113287906 SHA-1: 92a3bf646af70b85d830a3bb49ce48c0b7399ff9 SHA-256: f5419a81a126bda12a86d9a9bbe8f42a80f7c7a77903679602a4a9bece5f96ee
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 0.9997

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://crophysi.ru/strik?utm_term=manual+de+ingles+intermedio+pdf PDF link annotation
    • http://figawasazeso.iblogger.org/sivowozimibekow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_602a2cb63fb32.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/piluduzikulovu_mejijowe_totina_jubuvefaxif.pdfIn PDF document text
    • http://zozagemidifisep.22web.org/all_black_video_song_mp4_pagalworld.pdfIn PDF document text
    • https://nanoxoxudotu.weebly.com/uploads/1/3/0/8/130814682/f8dbbe2c1e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5fd3b19e2f932.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/kidibixojuk.pdfIn PDF document text
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/finef-gugilagub-kubunatelijam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonosolagosev.epizy.com/pujinotuxadanifo.pdfIn PDF document text
    • http://lojarine.epizy.com/malacate_manual_para_4x4.pdfIn PDF document text
    • http://fiwarirekagugen.epizy.com/55472549942.pdfIn PDF document text
    • http://tuganireriwem.rf.gd/81690784588.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/reading_comprehension_sequencing_worksheets_2nd_grade.pdfIn PDF document text
    • http://tamakibegotilo.epizy.com/arquitectura_japonesa_contemporanea.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/disability_tax_credit_federal_worksheet.pdfIn PDF document text
    • http://wabiredozu.rf.gd/57328140162.pdfIn PDF document text
    • http://lidesesepaz.rf.gd/free_beautiful_profile_pictures_for_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/roxevesasukalugere.pdfIn PDF document text
    • http://jeragapa.epizy.com/aagadu_movie_comedy_scenes_free.pdfIn PDF document text
    • http://dukojalili.rf.gd/rugejofomebajaromiwimof.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_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 5364 bytes
SHA-256: d3d6d81866fc4dbe71589a302334879ec2506a2ea7d02c476ecbda9df6524dda
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_02_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 11956 bytes
SHA-256: 0f294fdee6c9cc33d988b8fa41e23ecec03c263eede650d7664bee45c579e3cc