Malicious PDF — malware analysis report

Static analysis result for SHA-256 2358e67ddf5a70b6…

MALICIOUS

PDF

51.9 KB Created: 2020-09-30 23:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 13a613cbad4b32603a0bb3fe47a97502 SHA-1: 4120f08225b1c69fb4e6d1b5482955a9800b8ad1 SHA-256: 2358e67ddf5a70b6fe8e78c3de586607b0487a760ed8dcefbdffb352db76daa3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for redirector infrastructure. The ML classifier also flagged the PDF as malicious with high confidence. The document body, though heavily obfuscated, contains a URL that appears to be part of a phishing lure related to payment processing. The presence of many external links suggests an attempt to direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=ingenico+bs+payone+pdf In PDF document text
    • https://site-1039148.mozfiles.com/files/1039148/zelinoratufuvoma.pdfIn PDF document text
    • https://site-1037882.mozfiles.com/files/1037882/81546283105.pdfIn PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/nezulatorexijubexaxonax.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/70508228049.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/zifafosis.pdfIn PDF document text
    • http://files.thebrushandpallet.com/uploads/1/3/0/7/130739101/78a0a0.pdfIn PDF document text
    • http://tibab.hollishistoricalsociety.org/uploads/1/3/2/8/132815110/gomibarexev_tamugibolag_dutiruvupelolip.pdfIn PDF document text
    • http://files.ckdpc.org/uploads/1/3/1/4/131438294/mufonizetogipefovig.pdfIn PDF document text
    • http://divobe.carlukecollies.com/uploads/1/3/1/4/131406665/8906425.pdfIn PDF document text
    • http://files.aphroditesislet.com/uploads/1/3/2/6/132681460/4542461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7014/4166/files/sireloraxugubizoteguw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/pidoxifa.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_off00008d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D91 5372 bytes
SHA-256: f75844f058cfa26e30f893a5a3e07dbbf4b01ca8155ca6c27ac7fb598ccdff3f
font_01_sfnt_off00009ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFB 10348 bytes
SHA-256: a8f412e0eb10affdb4223715c307870ad2713a2c405925f8d3afbbe85b0f1a99

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