Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ab89b9d05c3475…

MALICIOUS

PDF

38.0 KB Created: 2020-04-03 11:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c98aa8acefe0b378bbdc76f4de2e614 SHA-1: eb36fe293271096c99a19d6d25121c6ed79acf14 SHA-256: 42ab89b9d05c34757165bf16460dae9ce9d62fde832bc311b0825190015e43d5
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO spamming technique. One of the embedded URLs, http://encounterbayplumbinggaselectrical.com/uploads/1/3/0/9/130969041/130969041.html#hp+officejet+6000+wireless+software+download, suggests a lure for downloading software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://encounterbayplumbinggaselectrical.com/uploads/1/3/0/9/130969041/130969041.html#hp+officejet+6000+wireless+software+download
    • http://specialhandscleaningservice.com/uploads/1/3/0/6/130603818/vevaxabuxebomepofo.pdf
    • http://jonctrask.net/uploads/1/3/0/8/130874472/bf1f7811ae12ed.pdf
    • http://scotiarootstours.com/uploads/1/3/1/4/131438211/9181140.pdf
    • http://www.tlpropertypreservation.com/uploads/1/3/0/4/130435631/napimutowijajesuj.pdf
    • http://jessicasipe.com/uploads/1/3/0/5/130589313/1464c.pdf
    • http://burtonuniversity.org/uploads/1/3/0/7/130739153/4838503.pdf
    • http://shorejunction.com/uploads/1/3/0/6/130604617/gunutakepugobasa.pdf
    • http://etsondemand.com/uploads/1/3/0/2/130287936/7180856.pdf
    • http://haikuwithaview.com/uploads/1/3/0/6/130620730/6d00a5c8de699.pdf
    • http://somethingbetterhouston.com/uploads/1/3/0/6/130603965/3016914.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_off0000689b.bin
296a1ed855343f1d07328f712132f80d0268ca4d2bc31ca53cdc47355b91fee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689B 9064 bytes

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