Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b4e247f00b3fc5…

MALICIOUS

PDF

34.1 KB Created: 2020-04-04 14:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8c278cdcb3d16c4f2bfac5a6f73c2c6 SHA-1: 98c80a1b634193adfdfc2718e5723ccfe1d4000b SHA-256: 51b4e247f00b3fc5f8838a5035b1b71272c7b2aa5a9ec9780e2fdfcf380b8d40
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to anorexia nervosa and mentions wkhtmltopdf, suggesting a potential lure or disguise. The primary function appears to be directing users to a network of linked PDFs, likely for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://platonschool.org/uploads/1/3/1/4/131437844/131437844.html#un+dibujo+de+la+anorexia+nerviosa
    • http://onedreamacademy.org/uploads/1/3/0/4/130488362/zagotuvepemaxan_mulasoxa_sizewe.pdf
    • http://mmcsupportlivemusic.com/uploads/1/3/0/7/130738501/pefefutowawaginupe.pdf
    • http://therapistnewjersey.com/uploads/1/3/0/9/130968976/0dbc223a165060.pdf
    • http://attainablebody.com/uploads/1/3/0/2/130272606/704d5663733.pdf
    • http://cookeryacademy.net/uploads/1/3/0/3/130313595/0ae3c6.pdf
    • http://xclusiveeventsmanagement.com/uploads/1/3/1/4/131406108/vibekozenuno.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_off00005d9c.bin
0b5403a7d4a49da2f669d87fd0b127de83e3583df047d2d0ee34b986c6f4bbb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 8332 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.