Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa223b4e0cd5e2b5…

MALICIOUS

PDF

39.2 KB Created: 2020-11-08 12:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ea873a72c01a6255ea23c1ea3603ae1 SHA-1: 791a4be8572975ffc474c1aab49f7210d09041b9 SHA-256: fa223b4e0cd5e2b52314099776d4fe5205e507b35050ebfc00f9d53c37e0b573
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains text related to 'County for zip code 34135' and includes URLs that are likely part of this link farm. The primary malicious activity appears to be directing users to a network of external sites, potentially for SEO manipulation or to serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffnew.ru/aws?keyword=county+for+zip+code+34135 PDF link annotation
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/4555137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f884b605316f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f8c1ea28b1c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_5f9d21b6956cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5f9173f598f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8d2e1d45336.pdfIn PDF document text
    • https://negorevir.weebly.com/uploads/1/3/4/4/134471844/8216165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5f996d057a33e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://balapep.files.wordpress.com/2020/11/phoenix_project_types_of_work.pdfIn PDF document text
    • https://nunuvekalu.files.wordpress.com/2020/11/39247744166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64273576-63c2-45a5-98db-ad818eb59bbb/72258678926.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_off00005a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A23 5216 bytes
SHA-256: e22bce84006599e5dfa03bb21a274dcbc4cd31fac5159ac76a52b433a8d38453
font_01_sfnt_off00006c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C19 10600 bytes
SHA-256: 7373d3ecb2439ede37539a10aecfea8d88827bb724dd94195656c32bf42ec30c