Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1101cab132eece…

MALICIOUS

PDF

37.1 KB Created: 2020-03-24 05:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3fd6b91940e165aa6d6777425733ed5c SHA-1: 3dc664a2c48c9b324864c8d924de1025afc170ed SHA-256: 5d1101cab132eece37ce8779edf0df1383781ea9424a3a4f5597b7b5590f2f4c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links points to a malicious intent to redirect users.

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://scrubs4work.com/uploads/1/3/0/6/130604521/130604521.html#imagenes+de+buenos+modales+en+la+escuela
    • http://madeinmb.com/uploads/1/3/0/6/130604585/kafew-xufude-polateluxusifev-dobefav.pdf
    • http://webdisk.midamericaprospects.com/uploads/1/3/0/4/130476273/9ee8cd8f6ebb3.pdf
    • http://highonpilates.com/uploads/1/3/0/5/130588864/zajetuwoluwa_xapiloranezef.pdf
    • http://thegrampo.com/uploads/1/3/0/4/130476586/380990e75ed5.pdf
    • http://villagetossandtumble.com/uploads/1/3/0/3/130379305/62581ca4.pdf
    • http://yardsalessource.com/uploads/1/3/0/5/130542852/rizenov-ninenuwam.pdf
    • http://cloudflare-resolve-to.selltvservice.com/uploads/1/3/0/6/130620354/9827418.pdf
    • http://cityonstage.com/uploads/1/3/0/4/130489725/816e8348b1cf0.pdf
    • http://bestconference.net/uploads/1/3/0/4/130476574/mulolibepojowil.pdf
    • http://centralbrowardtransitstudymeeting.com/uploads/1/3/0/3/130313314/jixijit.pdf
    • http://thecheapdatesband.com/uploads/1/3/0/7/130738576/4a745.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_off000068c9.bin
e952817bf6f7dfc4168438e36c6f975234909ef964975040e341c572cfe6bfe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C9 7904 bytes

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