Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a235b5556fee6e…

MALICIOUS

PDF

42.0 KB Created: 2020-10-04 16:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0149c638c90e82a471c1578d115c420d SHA-1: 54e1bff3481231b3c8c35cb0e32fe4bfa30c3d42 SHA-256: 59a235b5556fee6ee8109ab680a0dccf2b957c03073c4b0711f798cc31034034
192 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting an invoice lure, which is further supported by the SE_INVOICE_LURE heuristic. The PDF also hosts a large number of external links, many on disposable hosting, indicating a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cctraff.ru/strik?keyword=free+printable+invoice+template In PDF document text
    • https://site-1040443.mozfiles.com/files/1040443/zotofad.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/81708474380.pdfIn PDF document text
    • https://site-1042875.mozfiles.com/files/1042875/juruvexe.pdfIn PDF document text
    • https://site-1043934.mozfiles.com/files/1043934/60347574920.pdfIn PDF document text
    • http://files.rollepodiatry.co.uk/uploads/1/3/1/6/131637631/kewudijotu_pagerozejaxuwes.pdfIn PDF document text
    • http://jifis.swcare.com/uploads/1/3/1/8/131857204/64e16a.pdfIn PDF document text
    • http://files.danaberger.com/uploads/1/3/0/9/130969576/1731136.pdfIn PDF document text
    • http://genitixa.tysonbodnarchuk.ca/uploads/1/3/1/4/131454143/kujejexaxasek_vesakokil_mavirajufe_malutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd17d50-b1d0-4680-a836-11e710681608/11978546395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e83d510-55a9-4c40-b0e8-8924bfd737b3/53653403255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c3c707-b237-4cb7-af54-940c64c584b4/mexiwebidenesizazovedaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107578cb-8b20-42d7-8e0b-8a7a9bc6d382/balusulo.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_off000066dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DC 5056 bytes
SHA-256: 11a801620d1458e333fb122c846935ae858b9c346ba0bc6919d673a536249666
font_01_sfnt_off00007800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7800 10260 bytes
SHA-256: 1f083f06a390ac12eaccc978df9d9273908b54387f4ec1b5f6122178afdcbfcf

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