Malicious PDF — malware analysis report

Static analysis result for SHA-256 033e82164d96ea72…

MALICIOUS

PDF

84.4 KB Created: 2021-03-16 19:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 632cc90d7de38c42859f07bda2003667 SHA-1: 6f52f2d10f7c999fa115954d63f759dd93ddffd3 SHA-256: 033e82164d96ea72d52527728f5d5fb9a2d9f14341031eb95d726ba54e285cac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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/wix?keyword=lion+king+broadway+auditions+2020 PDF link annotation
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/jofoz-dijupa-fizasizenimovu-mikemuga.pdfIn PDF document text
    • http://kieverts.xyz/shiv_bhola_bhandari_ringtone_pagalworldsbq1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_603c1e60362a6.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/825873b5652.pdfIn PDF document text
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/bifosotajifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_602f5b4ea8c1e.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/xiwexun.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/gozaloraviwuz.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/kinagaluvawalo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_60082001b4bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_603e7fae7c480.pdfIn PDF document text
    • http://mosquito.codes/simple_and_compound_sentences_worksheet_for_grade_6n8o91.pdfIn PDF document text
    • https://walagikolisof.weebly.com/uploads/1/3/4/4/134494282/3865580.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/desaxume.pdfIn PDF document text
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/vesakalesaf-moxunedele-tenagalevo.pdfIn PDF document text
    • http://detonic-shop.website/casio_graphing_calculator_fx-9750gii-we_manualehiqb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375342/normal_5ff32d20e4fdb.pdfIn PDF document text
    • https://zasefupaboz.weebly.com/uploads/1/3/2/3/132302972/0eb242ff1.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://kifarir.rf.gd/animoto_pro_apk_full_free.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_095e3cda08b34177a8de060de3d6bf11.pdf?index=trueIn PDF document text
    • http://bumitorazefi.epizy.com/bled_castle_audio_guide.pdfIn PDF document text
    • http://zodexalanokaxaj.rf.gd/53186737437.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_ed97e039c6624ad08235f5293b1cc137.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_4a2b1f4013be446faffa99286a560824.pdf?index=trueIn PDF document text
    • http://ruzupaxenerod.epizy.com/fire_truck_toddler_bed_sheets.pdfIn PDF document text
    • http://penabak.epizy.com/what_happens_in_chapter_11_of_the_giver.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_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 5336 bytes
SHA-256: 38845e447a7f68abeccd83340e54422edadb311bea1f1fa4c1ebec9c31f19ea6
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 11388 bytes
SHA-256: 220c3bbaa53a554c6117c7e43b0089d63080cc18fac0a4c7a82fc0cbdfb5d71d
font_02_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230