Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c348cd3e63a68d…

MALICIOUS

PDF

80.7 KB Created: 2021-06-01 13:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: feb64abd35c5ba1302578fa352d4b394 SHA-1: 11cddf5d1e4e62a9914237152b22d599c0c35178 SHA-256: 58c348cd3e63a68d7df4882fa6ae6b74bd6dabc44a64829802e9cc77eb04b4a8
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly/pbworks hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. 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 sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/pbw?utm_term=star+wars+the+rise+of+skywalker+google+drive+mp4+full+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379029/normal_6031e89d885e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_6062b78f7edf7.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/4052655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5fdc598b07b1c.pdfIn PDF document text
    • https://patewolenapew.weebly.com/uploads/1/3/4/5/134525441/xonawuvojes.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/b9bef0ec508a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_601b1b7736780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_6042190a0c06f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_60291c13c99b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5fdd445886cbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fcbbe4ed56a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_602a77a60bee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_6042ec20a531a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_601a88767f8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_5fe99acd3bb5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosirata.pbworks.com/f/how_to_sell_karatbars.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144424014/dedutuxinigudukalopezuze.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144452118/kofuvaverav.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/vukusotimoralowu.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144417252/pujexifanewonemivorefefoz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 5964 bytes
SHA-256: bc0e433d8753e1760cf66d87b06a5dcc9c081c0354c2e78f9ec0c06f1bd44f13
font_01_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 11628 bytes
SHA-256: 2cfddc93e0a9e0e9c5d3eae8d5463a0054ce988f32cee814ba0d52776f9e1f3c

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