Malicious PDF — malware analysis report

Static analysis result for SHA-256 52af9e81b55e9bcb…

MALICIOUS

PDF

46.3 KB Created: 2020-03-23 12:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f82fb8b073890edbeb4ac518cb47e43 SHA-1: 88f6cf161561d9172a4fb70a4dabc7dd9355333f SHA-256: 52af9e81b55e9bcbd20c66155dcc4b57fad9f561b25af21771ad83805c528279
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the extensive link farm points to a malicious intent, likely to distribute further malware or engage in SEO abuse.

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://chicagostpatricksdayparade.net/uploads/1/3/0/5/130588913/130588913.html#hagwi+drink+cave+blocked
    • http://denotsdispensary.com/uploads/1/3/0/7/130740368/1798af273ab383.pdf
    • http://www.bluebeachpuntacana.com/uploads/1/3/0/6/130605255/00049b5f3d65a.pdf
    • http://www.lindseyjmarra.com/uploads/1/3/0/6/130604646/5f5df7c1f4.pdf
    • http://mta-sts.rozowawstazeczka.com.pl/uploads/1/3/0/7/130775209/acd2a801.pdf
    • http://growthdemons.com/uploads/1/3/0/6/130605111/9abc3bafa.pdf
    • http://omegasdepartmentstore.com/uploads/1/3/0/2/130288775/e44420bb.pdf
    • http://www.bomaderrytigersafl.com/uploads/1/3/0/4/130489696/4743371.pdf
    • http://cabacoa.com/uploads/1/3/0/7/130738998/kijiw_rugoxepu_vasufeso.pdf
    • http://taisk.com/uploads/1/3/0/4/130435573/xopufularoxoti.pdf
    • http://sweetfrivolity.net/uploads/1/3/0/7/130738637/408cf.pdf
    • http://whosrunningamerica.net/uploads/1/3/0/6/130621597/9946807.pdf
    • http://glambeautybarre.com/uploads/1/3/0/2/130271205/tesunesijojanujak.pdf
    • http://onebottle.info/uploads/1/3/0/6/130639781/wofuwadugik.pdf
    • http://www.thejourneypt.com/uploads/1/3/0/7/130775221/mafame-lanebezi.pdf
    • http://insidecampuscorner.net/uploads/1/3/0/7/130739000/gavilub.pdf
    • http://digitalparentconsulting.com/uploads/1/3/0/6/130604551/5b315da57d.pdf
    • http://www.bajakayakoutfitters.com/uploads/1/3/0/2/130287413/2b8a0.pdf
    • http://konstructbuildersma.com/uploads/1/3/0/4/130490561/remisixidedeva.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_off00008efe.bin
f01a178ba78834431d604cf088292912f66f0c2b189c5e1a8f578bd74e74a33b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFE 7384 bytes