Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb322ca92addeae…

MALICIOUS

PDF

69.4 KB Created: 2021-03-18 10:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de43ff12b2c6c4a16a54cfb4b0104227 SHA-1: 1bc472ae4307852aa0c44ea111f1705fdd9e3051 SHA-256: 8bb322ca92addeae4213a8dafe9bee57fb44fc07972b0a3baed44034384e124e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://vilenefex.ru/123?utm_term=interrogative+worksheets+grade+4 PDF link annotation
    • http://zhigina.ru/50_shades_of_grey_part_2_netflixkcbn7.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/67402991098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fdc0fbf6913e.pdfIn PDF document text
    • http://exampl1214.com/el_toro_ferdinando_cuentokaeuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5fda25ca91920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_602ce3508d39f.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/liletitofigokexi.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/rokevekujidupofoxub.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/henrik_ibsen_a_dolls_house_movie.pdfIn PDF document text
    • http://ukranews.site/seminar_report_on_biometrics_technologyb6qg4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5fd84c0040142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_600ae93f19762.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://kubomefewofumim.atwebpages.com/revol.pdfIn PDF document text
    • http://joriboka.epizy.com/differences_between_endotoxins_and_exotoxins.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/spinoza_theological_political_treatise_summary.pdfIn PDF document text
    • http://xenupodaxamutev.rf.gd/les_misrables_songs_in_french.pdfIn PDF document text
    • http://kezulixu.rf.gd/ligifarufaxoniga.pdfIn PDF document text
    • http://vorowoluxeku.rf.gd/87172813507.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/watch_the_white_princess_episode_7_online_free.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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 5084 bytes
SHA-256: d66d9415b881d934efc43f0cf7fc3a684920b35e4e8ebd23050e9233fa45875d
font_01_sfnt_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 10532 bytes
SHA-256: 1552c5f4210f9ad043e70f76f8db1e3714254a44ca701e481b5a054b0c390505
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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