Malicious PDF — malware analysis report

Static analysis result for SHA-256 322261c72a5b889c…

MALICIOUS

PDF

36.8 KB Created: 2020-04-02 11:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dff72babaef399dfbeb9834068055372 SHA-1: 01623f7f03a162629138a336c39cdcbc7949a03c SHA-256: 322261c72a5b889c074af153330be8aee9afdef44a8549c2bfeec2ba5aacd905
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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://ebmccallanbuildingltd.com/uploads/1/3/0/7/130775737/130775737.html#qu%C3%A9+diferencia+hay+entre+genotipo+y+fenotipo
    • http://spareforchange.com/uploads/1/3/0/5/130589035/4077637.pdf
    • http://knoxvillerealtygroup.com/uploads/1/3/0/8/130874233/larar.pdf
    • http://officermnop.com/uploads/1/3/0/6/130620282/nonarazesuwede_voxajaxoruvep_nuzari.pdf
    • http://neubrow.net/uploads/1/3/0/7/130739654/1e53c930.pdf
    • http://weighlesseasymeals.com/uploads/1/3/0/6/130604104/55594.pdf
    • http://bryanwalton.com/uploads/1/3/0/8/130874012/7142166.pdf
    • http://nrgpropertyservices.org/uploads/1/3/0/6/130621385/1873428.pdf
    • http://901parkave.com/uploads/1/3/1/4/131483143/kadorika.pdf
    • http://lilidesignstudio.com/uploads/1/3/0/7/130775384/disiwumu.pdf
    • http://stuffedinbozeman.com/uploads/1/3/0/7/130739253/1adebdd76.pdf
    • http://astrox.style/uploads/1/3/0/7/130776850/19c16721.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_off000068b8.bin
6f8f7a535e6f607b8cce05ce7112a6cf5398395cd6c82a7a724a4f8c0dc0c953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B8 7812 bytes

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