Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ceed5268047356…

MALICIOUS

PDF

41.8 KB Created: 2020-04-05 11:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36943244e0be2c490dc377c223f8e1e6 SHA-1: 518a2fe12784a4525dc079e260c50debc3670687 SHA-256: d5ceed526804735632277628dc909f5aaf4b26944a8ee4606ee4b98cc7aff754
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body text is largely unreadable due to encoding issues, but the presence of numerous external links suggests a link farm or distribution mechanism for further malicious content. No scripts were extracted from this sample.

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://listeningforlove-poetryforscientists.net/uploads/1/3/0/8/130814868/130814868.html#que+son+las+ciencias+factuales+ejemplos
    • http://desert-moon-studio-online.com/uploads/1/3/0/6/130620972/legumafok.pdf
    • http://draclaudiagarfunkel.com/uploads/1/3/0/7/130739430/dagepofivubu.pdf
    • http://suiterbuilders.com/uploads/1/3/0/7/130738917/livafop-muwudabu-zonifesinos.pdf
    • http://stephanieschott.com/uploads/1/3/0/6/130620788/1092313.pdf
    • http://cilibertirealestate.com/uploads/1/3/0/2/130273913/8386602.pdf
    • http://olaskarinjournalismpiecesprofile.com/uploads/1/3/0/7/130739470/xineval.pdf
    • http://thomassclarea.org/uploads/1/3/0/6/130622066/bafer.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_off00007840.bin
35cfe5d2704401fdd65a61efd8a3116e19d8f207dd4b5d73e2e736a2b00005b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7840 9020 bytes

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