Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1dedd955404114…

MALICIOUS

PDF

35.1 KB Created: 2020-04-25 01:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26a42c8fbd8712482c06e25b6f8eec26 SHA-1: 0197ded50c87ab0e784b1ac5d1aa9f0ee380d452 SHA-256: de1dedd9554041142f2e6cf3c1884525089b9aca3830a6d4af9bf8ac53e63fb3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of external links, characteristic of a link farm. The document body is heavily obfuscated, but the presence of multiple PDF_URI and PDF_SEO_LINK_FARM heuristics indicates an attempt to direct users to various external domains. The primary intent appears to be SEO manipulation or potentially distributing further malicious payloads via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://youbrewchicago.com/uploads/1/3/1/1/131164079/131164079.html#symmetric+bilinear+form+self-+adjoint
    • http://jrdfittedkitchensandwardrobes.uk/uploads/1/3/0/2/130271113/juloxoju-xawotu-rujex-kenudi.pdf
    • http://wipethefrog.com/uploads/1/3/0/4/130476308/gerisufa-bojefugog-polunobajobeka.pdf
    • http://thejonellaqueen.com/uploads/1/3/0/6/130639406/d5331802a9b250.pdf
    • http://greaterwoodlandspublicart.org/uploads/1/3/0/8/130813118/mivawebemuxol.pdf
    • http://ceruleanmanagement.com/uploads/1/3/0/7/130740146/mikotawutefufadufe.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_off000062dd.bin
e2c9fe342f775bf77a1a7b45fc10e11b9bfad38ad7ec474999e62a395546e457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DD 7844 bytes

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