Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb090a45bb6bb805…

MALICIOUS

PDF

38.5 KB Created: 2020-03-08 02:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 6be4c8e7990f8f9fefbc0ff95948b25e SHA-1: e5f4d9e60751a04e375defac57c34329f8d98061 SHA-256: eb090a45bb6bb80571dd8fa78f51784b5d84c06099ab956cb7b9bd9b9ca1b264
96 Risk Score

Malware Insights

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

The PDF document is designed to appear as a resignation letter, a common social engineering tactic. It contains a large number of embedded external links, primarily pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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 http://portalcoabana.com/uploads/1/3/0/5/130588280/130588280.html#sample+of+resignation+letter+in+word+format PDF link annotation
    • http://mydietea.com/uploads/1/3/0/7/130775180/2881320.pdfIn PDF document text
    • http://www.kristendellapace.com/uploads/1/3/0/8/130873771/5241053.pdfIn PDF document text
    • http://geneticcrossroadradio.com/uploads/1/3/0/6/130605278/tavoxuvanef_notasugedesate_xozujajida_matosututexizas.pdfIn PDF document text
    • http://toallthemen.com/uploads/1/3/0/5/130546392/019276b.pdfIn PDF document text
    • http://jacquiehuser.com/uploads/1/3/0/4/130490155/7461164.pdfIn PDF document text
    • http://oxtapas.com/uploads/1/3/0/5/130540290/1802567.pdfIn PDF document text
    • http://www.ehmarkham.com/uploads/1/3/0/7/130740561/d4d734a.pdfIn PDF document text
    • http://archivetradingcompany.com/uploads/1/3/0/4/130435654/rinivozi.pdfIn PDF document text
    • http://fallentravelers.com/uploads/1/3/0/7/130776688/6081061.pdfIn PDF document text
    • http://blogdeviajes.net/uploads/1/3/0/3/130313379/8256014.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

Related samples 2

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_off00006e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E96 7752 bytes
SHA-256: 813240d7217dcec0b6aa938e16af20eadfc61f05531bc18d8642f0d8daf0adbe

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