Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb7fec2f260ba1b…

MALICIOUS

PDF

55.1 KB Created: 2020-11-06 21:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9ded6fbffc7d150b26fd338c1463bd0d SHA-1: be8e97f544af75b0c0e92cb424e24eec2a62c537 SHA-256: 8fb7fec2f260ba1bd8df7656f388d0dbb58333eb1df46154df9a1fcd9a3b9408
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also strongly indicated maliciousness. The embedded URLs and the document body suggest a link farm intended to manipulate search engine results or distribute further content, rather than a direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffine.ru/123?keyword=the+jungle+quotes+about+family PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f9e92ead4a09.pdfIn PDF document text
    • https://jeburetuzof.weebly.com/uploads/1/3/4/3/134306955/928d0b.pdfIn PDF document text
    • https://wanezetisozol.weebly.com/uploads/1/3/4/4/134468493/budata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f9b88c56bc48.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/aee0e7964b8.pdfIn PDF document text
    • https://nabisipiguges.weebly.com/uploads/1/3/4/4/134432296/4937290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f870e0fd62fa.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/e9756cb1c6.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://sazaluxi.files.wordpress.com/2020/11/free_printable_barbie_dress_sewing_patterns.pdfIn PDF document text
    • https://zetetojowu.files.wordpress.com/2020/11/makekebivuveb.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/27994747786.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/20059107081.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://romekelisefo.files.wordpress.com/2020/11/nitunawikudaremutujozudok.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/30922555098.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_off00008c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C41 5360 bytes
SHA-256: e12e9d44be5090c1514a1732b471da9c1e4edbc100fac67926c5a0b6da740c42
font_01_sfnt_off00009e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E64 10284 bytes
SHA-256: 060a6950cbcd4176a668d7319c76fc4183993116992f060373b9d41f0f846a66
font_02_sfnt_off0000c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC159 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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