Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6cf7b3086679af…

MALICIOUS

PDF

38.6 KB Created: 2020-04-10 00:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5277473b65946a9da09775db971e45b SHA-1: b49a9e7e906ce10e4b9d6d678c89db137f019a2d SHA-256: 0c6cf7b3086679aff424c8a2c10ffb65a20be78b0b2165ec204b8e4ee0e00bfe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, limiting the ability to determine specific payload delivery or execution methods.

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://bridgecapitalaz.com/uploads/1/3/0/7/130775778/130775778.html#jobassam+gu+result
    • http://littleempirepodcasts.com/uploads/1/3/0/8/130874015/3e8542653.pdf
    • http://leisureleather.net/uploads/1/3/0/5/130588876/5044643.pdf
    • http://tvyapp.com/uploads/1/3/1/3/131384654/bivupidip.pdf
    • http://oregonictonickombucha.com/uploads/1/3/1/4/131437333/pewaxupi_bidufexef.pdf
    • http://susiehallrealtestate.com/uploads/1/3/0/2/130289675/lazogularuturumuj.pdf
    • http://localhoneybtq.com/uploads/1/3/0/5/130588603/vajiveziliwazet.pdf
    • http://thesmelloflove.net/uploads/1/3/0/7/130775465/efff589d09f5.pdf
    • http://zootherapievalais.com/uploads/1/3/0/6/130620646/0e766f18b2d1.pdf
    • http://rentsnowshoemountain.com/uploads/1/3/0/2/130270917/798486.pdf
    • http://revdeb.net/uploads/1/3/0/5/130543402/99a50b86.pdf
    • http://radicalconceptsaz.com/uploads/1/3/0/6/130639087/3451645.pdf
    • http://mrsphillipskindergarten.com/uploads/1/3/1/3/131398368/5204189.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d93.bin
dfc372765b2067e61dd6456e84b89eb6ea7dc32ba537d8c2ce0c28a71915f365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D93 8364 bytes

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