Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade7c0d732f02afe…

MALICIOUS

PDF

84.1 KB Created: 2020-06-18 15:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a69d55acb68057eb53e6566a2bc627 SHA-1: 44811f993d8a8aac3c4be363f803cd291cc8f3b6 SHA-256: ade7c0d732f02afedfbdacd610b23af2e40dbe4f0390c245c5cd33803e7c8a1f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains. This technique is commonly used for SEO poisoning or to distribute malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect users to potentially harmful content.

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://urbanvertical.ca/uploads/1/3/0/2/130270979/130270979.html#plant+extraction+method+pdf
    • http://sweetstuffbake.shop/uploads/1/3/0/6/130620522/vibosunelonopujepa.pdf
    • http://mebrukerrad-info.no/uploads/1/3/1/0/131069874/aee2f2986f6.pdf
    • http://cashbackunion.com/uploads/1/3/0/6/130639800/budoxoginot_wewekali.pdf
    • http://mediamax.ca/uploads/1/3/0/6/130621005/4469947.pdf
    • http://eliteadvisory.net/uploads/1/3/0/8/130814341/kajajobijukilejizor.pdf
    • http://3qh.undesirable.us/uploads/1/3/1/4/131437183/47651b2bea06a7.pdf
    • http://lttvisas.com/uploads/1/3/1/3/131379836/tezajes_lodasaxozurunap_xavavu_rujok.pdf
    • http://webmail.placervillechurchofchrist.com/uploads/1/3/1/3/131384402/xoxuzunujavow.pdf
    • http://storerooms.us/uploads/1/3/0/6/130622058/01d8e1bd.pdf
    • http://horizonsksu.com/uploads/1/3/0/8/130873880/844f1.pdf
    • http://theagelessfactor.com/uploads/1/3/1/3/131380623/850908.pdf
    • http://mrcheeseexpress.com/uploads/1/3/0/7/130739593/2711076.pdf
    • http://eliteadvisory.net/uploads/1/3/0/8/13081434
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c23.bin
799dfd5a5f6ef4ee7a55d7efe6717e5e6f8b3760b9cd676b32c6df38125c22f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 5076 bytes
font_01_sfnt_off00011d2c.bin
d7eae19c7b27e58972cc7ffd2a04f652c51370a7f51c4aed9f5b460c69a07dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 11444 bytes

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