Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7d06fe7ed67809…

MALICIOUS

PDF

41.9 KB Created: 2020-05-22 11:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: acdb57d7a92c9f724b30bc1d47577cce SHA-1: 00b11938c1bb6bf5af3f2211047d01484f82fda5 SHA-256: 4a7d06fe7ed67809f75455aff12a1485fda35dbe6a9ebf8e5dabfe8170f03ed2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to redirect users to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://cozyoasis.com/uploads/1/3/0/5/130543575/130543575.html#dos+columnas+en+latex PDF link annotation
    • http://adroofingservices.com/uploads/1/3/0/4/130488542/8889133.pdfIn PDF document text
    • http://margaritecamaj.com/uploads/1/3/0/2/130289421/letatugubonodus.pdfIn PDF document text
    • http://dqwaynesboro.com/uploads/1/3/0/4/130436224/6187607.pdfIn PDF document text
    • http://themagiclibrary.online/uploads/1/3/1/4/131454733/959500c.pdfIn PDF document text
    • http://4v5.undesirable.us/uploads/1/3/0/2/130289338/4f8e1de13018b51.pdfIn PDF document text
    • http://chosenbeats.com/uploads/1/3/0/2/130271259/bodusubesosajitowu.pdfIn PDF document text
    • http://workplacela.com/uploads/1/3/0/3/130379504/pozibut_zobajakorut.pdfIn PDF document text
    • http://principal.queenanneelementary.com/uploads/1/3/0/8/130874211/73c1d6cc892.pdfIn PDF document text
    • http://regionalresilience.com/uploads/1/3/1/0/131070485/3858271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72F6 12256 bytes
SHA-256: 44a20b92c7036ca9c9bfc51c0d2ffe78e8310236ca42f42d514cf3024b239381

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