Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b448512b9320c83…

MALICIOUS

PDF

38.7 KB Created: 2020-05-24 17:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22a03eabef79596acee583cac1160f87 SHA-1: 1ccef40b97a95391ba64229707fae977567ad54f SHA-256: 8b448512b9320c834fbb7d58e22bce2554e71ceb93454061b13a8910dc23009d
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains several URLs that are also listed in the extracted URLs, suggesting a deliberate attempt to create a link farm. The primary purpose appears to be directing users to a multitude of external PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ambtcex.com/uploads/1/3/0/6/130621874/130621874.html#adenopathie+coelio+mesenterique
    • http://soontechdevelopmentlimited.com/uploads/1/3/0/3/130379814/1027560.pdf
    • http://dsr20.com/uploads/1/3/1/4/131406527/jurunariru-wobud.pdf
    • http://zihuatanejo-penthouse.com/uploads/1/3/0/6/130621581/soxejulavimu.pdf
    • http://escensio.com/uploads/1/3/0/5/130543020/vodapuloporavato.pdf
    • http://toursofneworleans.net/uploads/1/3/0/5/130550672/senorijejum_zekabare.pdf
    • http://commonclimber.net/uploads/1/3/0/7/130775405/3451239.pdf
    • http://improvabcs.com/uploads/1/3/1/3/131382113/rogonugutizax_fibemovobepev.pdf
    • http://lepinbuildingblocksau.com/uploads/1/3/0/2/130271068/15f8df.pdf
    • http://faithcommunitynewtork.org/uploads/1/3/0/7/130740087/maxeb.pdf
    • http://cpanel.espaiamat.com/uploads/1/3/0/5/130546759/b941cd47d0822e7.pdf
    • http://saintjosephsuites.com/uploads/1/3/0/6/130604878/106118a.pdf
    • http://baycoastnurses.org/uploads/1/3/0/6/130620511/dovabidozovikur.pdf
    • http://adieapriyadi.net/uploads/1/3/0/2/130289353/gugimemogele_tudidejixexoso.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_off000068c4.bin
ae5de5641d5b7c1bc4e74e6fd07b635578a40664637760ca453fe45cf639cbce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C4 12012 bytes

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