Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e44af8cda3ef798…

MALICIOUS

PDF

47.4 KB Created: 2020-11-08 09:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c2eb3d33107c969b999c893a1367afa SHA-1: d16df6a9853da3f590ae81d2683c987116165bf5 SHA-256: 8e44af8cda3ef79818ee89d8dd7a849ebe3d20c5a512bd166b1dc00ecce73e9a
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 1.0000

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://traffset.ru/123?keyword=bumblebee+123+movies PDF link annotation
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/jeziwaradovagu.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/3c60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5f936af0e00b3.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/dipiseposoban.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
    • https://bimoladotaj.files.wordpress.com/2020/11/31308055012.pdfIn PDF document text
    • https://goviwav.files.wordpress.com/2020/11/problemas_de_composicion_de_funciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81501309-b9a5-4a79-8b07-ce31600329e4/78137874722.pdfIn PDF document text
    • https://pomutap.files.wordpress.com/2020/11/sky_high_full_movie_in_hindi_free_download_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f043895-d9bb-4a15-ba03-9ee96bbd37a2/29097371469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdb7abb-89bb-41f0-bf5e-ad4133c37bb2/temifelos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f140af0b-eaad-4c98-a0e7-94bdc4ccc2c4/where_to_watch_detective_pikachu_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de334bc-a6eb-4ec4-82c9-20d2d4677014/nuwegozovudavumot.pdfIn PDF document text
    • https://zepegegudo.files.wordpress.com/2020/11/c105.2_form_new_york.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_off0000644f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644F 4816 bytes
SHA-256: 6a16518416e68c4c8f487de35a1b61015ac27eb846b7a4cd41297de2adc23cf2
font_01_sfnt_off000074bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BF 14476 bytes
SHA-256: eeace470f2c01fe4170b72740b3253b68dca724beb1fb5edfaa09355d250244c
font_02_sfnt_off0000a2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2FE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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